Separated by a Common Language

Editor Mark recently wrote (to) me to suggest the different meanings of pound sign (or pound symbol) as a Twitter Difference of the Day.  In the US, pound sign/symbol is usually understood to refer to this thing: #.  It is also called the number sign in AmE, where it is used to signify the...

I'm sure I missed many opportunities when writing about games recently, but I almost immediately reali{s/z}ed I'd omitted (BrE) noughts and crosses/(AmE) tic-tac-toe. Clearly, the BrE name is naming the symbols used in the game: O and X. In AmE, however, those symbols are usually called by the...