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The symbols mean something in japanese - although the meaning of two of them are swapped for the rest of the world:
O - confirm (when you come out of a japanese subway station you go through the exists marked with an O)
X - cancel (if you see an subway exit with a cross, that's a no go)

My g/f works for a japanese company and has seen the square and triangle used in spreadsheets for meaning as well, but I've forgotten what.

Have a look here: http://japanesetranslator.co.uk/portfolio/playstation-symbols/