If writing an x while writing a sentence, I’ll do number 8, but if writing an x while using algebra, I’ll do a ‘curly’ x, sort of like two letter ‘c’s, back to back. (I’ve always been told that mathematicians do this to help distinguish between an ‘x’ and a multiplication sign, which seems feasible, but I don’t know for sure if it’s true...)
8 for me. I'm a southpaw/cackhanded wandering if there's correlation? One thing I've noticed from a couple of left handers of my acquaintance is that they do ticks backwards. The big bit then the little bit. They should be hung as witches.
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For lower case 9 (as Lord Romford suggested, it's a hangover from doing A-level Maths)