I stumbled across the answer to what was a small riddle to me for many years: the meaning of the 〼 mark in the picture I took of a shop window in Kyoto.
The 〼 is pronounced "masu". A masu (also 枡 or 升) was a square wooden box used to measure rice and the sign is a pictogram of a masu.
But it is also used purely phonetically, like here, as a shorthand for ます. So スーツ有り〼 is スーツあります "suutsu arimasu" which means "we have suits".
Simple once you know but hard to find out.
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