Non-binary "singular they" endorsed by Merriam-Webster
"Singular 'they': Though singular 'they' is old, 'they' as a nonbinary proonoun is new — and useful", Merriam-Webster Words We're Watching:
Much has been written on they, and we aren’t going to attempt to cover it here. We will note that they has been in consistent use as a singular pronoun since the late 1300s; that the development of singular they mirrors the development of the singular you from the plural you, yet we don’t complain that singular you is ungrammatical; and that regardless of what detractors say, nearly everyone uses the singular they in casual conversation and often in formal writing.
They is taking on a new use, however: as a pronoun of choice for someone who doesn’t identify as either male or female. This is a different use than the traditional singular they, which is used to refer to a person whose gender isn’t known or isn’t important in the context, as in the example above. The new use of they is direct, and it is for a person whose gender is known, but who does not identify as male or female. If I were introducing a friend who preferred to use the pronoun they, I would say, “This is my friend, Jay. I met them at work.”
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