In trade chat, I was trying to announce a TO deal involving steel swords. But when I abbreviated steel swords to st swords, the 'st' got asterisk censored. So ppl started trying other legitimate uses of 'st'. As an abbreviation of street in an address - censored. As an abbreviation of saint, as in St Patrick's Day - censored.
Not a huge hairy deal or a gamestopper - but does seem to be a mistake in the censor filter.