anon: https://rentry.co/rq-archive Various terms.
There mentioned a reason why transid was coined instead of transx.
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Archive of Rentry: https://archive.md/LLu8L
Quote of reason on the archived second link:
“Due to it [transx] being similar to transX, a term created by transmeds for non-binary people who are dysphoric, the more common umbrella term is now transidentity/transid.”