What are the yellow stickers with the letter G and one or two arrows on some Japanese streets?

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I've been traveling around Japan recently and I've come across these stickers with the letter "G" and one or two arrows in many streets in Tokyo, Osaka and Kyoto.





Some streets have dozens of them. What do they mean?










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    up vote
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    down vote

    favorite
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    I've been traveling around Japan recently and I've come across these stickers with the letter "G" and one or two arrows in many streets in Tokyo, Osaka and Kyoto.





    Some streets have dozens of them. What do they mean?










    share|improve this question









    New contributor




    Jaime Caffarel is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
    Check out our Code of Conduct.





















      up vote
      46
      down vote

      favorite
      4









      up vote
      46
      down vote

      favorite
      4






      4





      I've been traveling around Japan recently and I've come across these stickers with the letter "G" and one or two arrows in many streets in Tokyo, Osaka and Kyoto.





      Some streets have dozens of them. What do they mean?










      share|improve this question









      New contributor




      Jaime Caffarel is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.











      I've been traveling around Japan recently and I've come across these stickers with the letter "G" and one or two arrows in many streets in Tokyo, Osaka and Kyoto.





      Some streets have dozens of them. What do they mean?







      japan






      share|improve this question









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      Jaime Caffarel is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.











      share|improve this question









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      edited 20 mins ago









      pipe

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      asked yesterday









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          1 Answer
          1






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          It's a marker for a buried gas pipeline. Arrow points to where the gas heads to. The marker is used to easily identify which areas need to be dug up, in case maintenance (e.g. pipe replacement) is needed, or to avoid the pipes during excavation work.



          Reference (in Japanese):
          http://www.yotsugi.co.jp/products/detail/233






          share|improve this answer










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          DXV is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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          • 2




            Why the Latin letter G and not the first Japanese character in the Japanese words "gas"? Not universal or ISO enough?
            – cat
            18 hours ago










          • @cat jisho.org/search/gas It looks like only one character would not be sufficient to know what might be meant.
            – Andy
            14 hours ago






          • 1




            @cat I don't know the reason, but they sometimes use nails with the word for gas is spelled out. There are nails that also use just a G. See link
            – DXV
            13 hours ago











          • gas in japanese is just ガス which is romanized as Gasu (and pronounced basically the same as terminal u are often ghosted), and all Japanese are required to study Japanese and so will know this romanization. why not ガ? I'm not sure...
            – MichaelChirico
            1 hour ago










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          1 Answer
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          1 Answer
          1






          active

          oldest

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          active

          oldest

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          active

          oldest

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          up vote
          64
          down vote



          accepted










          It's a marker for a buried gas pipeline. Arrow points to where the gas heads to. The marker is used to easily identify which areas need to be dug up, in case maintenance (e.g. pipe replacement) is needed, or to avoid the pipes during excavation work.



          Reference (in Japanese):
          http://www.yotsugi.co.jp/products/detail/233






          share|improve this answer










          New contributor




          DXV is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
          Check out our Code of Conduct.













          • 2




            Why the Latin letter G and not the first Japanese character in the Japanese words "gas"? Not universal or ISO enough?
            – cat
            18 hours ago










          • @cat jisho.org/search/gas It looks like only one character would not be sufficient to know what might be meant.
            – Andy
            14 hours ago






          • 1




            @cat I don't know the reason, but they sometimes use nails with the word for gas is spelled out. There are nails that also use just a G. See link
            – DXV
            13 hours ago











          • gas in japanese is just ガス which is romanized as Gasu (and pronounced basically the same as terminal u are often ghosted), and all Japanese are required to study Japanese and so will know this romanization. why not ガ? I'm not sure...
            – MichaelChirico
            1 hour ago














          up vote
          64
          down vote



          accepted










          It's a marker for a buried gas pipeline. Arrow points to where the gas heads to. The marker is used to easily identify which areas need to be dug up, in case maintenance (e.g. pipe replacement) is needed, or to avoid the pipes during excavation work.



          Reference (in Japanese):
          http://www.yotsugi.co.jp/products/detail/233






          share|improve this answer










          New contributor




          DXV is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
          Check out our Code of Conduct.













          • 2




            Why the Latin letter G and not the first Japanese character in the Japanese words "gas"? Not universal or ISO enough?
            – cat
            18 hours ago










          • @cat jisho.org/search/gas It looks like only one character would not be sufficient to know what might be meant.
            – Andy
            14 hours ago






          • 1




            @cat I don't know the reason, but they sometimes use nails with the word for gas is spelled out. There are nails that also use just a G. See link
            – DXV
            13 hours ago











          • gas in japanese is just ガス which is romanized as Gasu (and pronounced basically the same as terminal u are often ghosted), and all Japanese are required to study Japanese and so will know this romanization. why not ガ? I'm not sure...
            – MichaelChirico
            1 hour ago












          up vote
          64
          down vote



          accepted







          up vote
          64
          down vote



          accepted






          It's a marker for a buried gas pipeline. Arrow points to where the gas heads to. The marker is used to easily identify which areas need to be dug up, in case maintenance (e.g. pipe replacement) is needed, or to avoid the pipes during excavation work.



          Reference (in Japanese):
          http://www.yotsugi.co.jp/products/detail/233






          share|improve this answer










          New contributor




          DXV is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
          Check out our Code of Conduct.









          It's a marker for a buried gas pipeline. Arrow points to where the gas heads to. The marker is used to easily identify which areas need to be dug up, in case maintenance (e.g. pipe replacement) is needed, or to avoid the pipes during excavation work.



          Reference (in Japanese):
          http://www.yotsugi.co.jp/products/detail/233







          share|improve this answer










          New contributor




          DXV is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
          Check out our Code of Conduct.









          share|improve this answer



          share|improve this answer








          edited yesterday





















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          answered yesterday









          DXV

          47838




          47838




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          New contributor





          DXV is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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          DXV is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
          Check out our Code of Conduct.







          • 2




            Why the Latin letter G and not the first Japanese character in the Japanese words "gas"? Not universal or ISO enough?
            – cat
            18 hours ago










          • @cat jisho.org/search/gas It looks like only one character would not be sufficient to know what might be meant.
            – Andy
            14 hours ago






          • 1




            @cat I don't know the reason, but they sometimes use nails with the word for gas is spelled out. There are nails that also use just a G. See link
            – DXV
            13 hours ago











          • gas in japanese is just ガス which is romanized as Gasu (and pronounced basically the same as terminal u are often ghosted), and all Japanese are required to study Japanese and so will know this romanization. why not ガ? I'm not sure...
            – MichaelChirico
            1 hour ago












          • 2




            Why the Latin letter G and not the first Japanese character in the Japanese words "gas"? Not universal or ISO enough?
            – cat
            18 hours ago










          • @cat jisho.org/search/gas It looks like only one character would not be sufficient to know what might be meant.
            – Andy
            14 hours ago






          • 1




            @cat I don't know the reason, but they sometimes use nails with the word for gas is spelled out. There are nails that also use just a G. See link
            – DXV
            13 hours ago











          • gas in japanese is just ガス which is romanized as Gasu (and pronounced basically the same as terminal u are often ghosted), and all Japanese are required to study Japanese and so will know this romanization. why not ガ? I'm not sure...
            – MichaelChirico
            1 hour ago







          2




          2




          Why the Latin letter G and not the first Japanese character in the Japanese words "gas"? Not universal or ISO enough?
          – cat
          18 hours ago




          Why the Latin letter G and not the first Japanese character in the Japanese words "gas"? Not universal or ISO enough?
          – cat
          18 hours ago












          @cat jisho.org/search/gas It looks like only one character would not be sufficient to know what might be meant.
          – Andy
          14 hours ago




          @cat jisho.org/search/gas It looks like only one character would not be sufficient to know what might be meant.
          – Andy
          14 hours ago




          1




          1




          @cat I don't know the reason, but they sometimes use nails with the word for gas is spelled out. There are nails that also use just a G. See link
          – DXV
          13 hours ago





          @cat I don't know the reason, but they sometimes use nails with the word for gas is spelled out. There are nails that also use just a G. See link
          – DXV
          13 hours ago













          gas in japanese is just ガス which is romanized as Gasu (and pronounced basically the same as terminal u are often ghosted), and all Japanese are required to study Japanese and so will know this romanization. why not ガ? I'm not sure...
          – MichaelChirico
          1 hour ago




          gas in japanese is just ガス which is romanized as Gasu (and pronounced basically the same as terminal u are often ghosted), and all Japanese are required to study Japanese and so will know this romanization. why not ガ? I'm not sure...
          – MichaelChirico
          1 hour ago










          Jaime Caffarel is a new contributor. Be nice, and check out our Code of Conduct.









           

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