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Hmm, combination of three symbols:
¬ - logical not
' - apostrophe or comma or single quote?
| - pipe
It's the key that sits to the left of the number 1 key on a UK ISO board - `¬¦ it's just the colour of this one that makes it obscure.
Usless trivia, the third symbol is wrong on the cap, it should be a broken pipe - pipe sits on the key to the right of the left shift for UK ISO, indicated by a broken pipe symbol of course...although this isn't unique to that particular cap or to Cherry sets in general IIRC.