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This three-sided pole on an airport tram
(sh.itjust.works)
I had never seen one of these before today. They're great. Way better than reaching for a single pole in a crowded car and wrapping your hand around some stranger's fingers. And If you have the whole thing to yourself you can hook your arm through it.
These are pretty common where i live. You will be thankful to find a spot to hold on to on rush hour though.
I can still remember the awkward accidental grabbing of hands in a crowded public bus when I came back from school.