I'm not from London myself but I've never heard a Londoner [or southerner] use Pony in that sense. I've often heard it used for an amount of money. £20 I think

I'm not from London myself but I've never heard a Londoner [or southerner] use Pony in that sense. I've often heard it used for an amount of money. £20 I think. When I read your opening 'I wonder if there's somewhere that people can propose a name for things and people can tell them why they might want to use something else...' I thought you were going to go on to make a point about not using everyday words [or single letters] as the name for your new programming language, as they'll be unsearchable. And everyone will end up tagging -lang' onto the end of the name, to discriminate. EDIT: I was a fiver out. A 'pony' is apparently £25: https://www.cockneyrhymingslang.co.uk/subjects/money https://www.cockneyrhymingslang.co.uk/subjects/money