It's an English term for Latinos that non-Latinos in the U.S. use to signal inclusiveness (usually gender inclusiveness these days, but its history includes some LGBT inclusiveness as well). You see it a lot in corporate emails about awareness and sometimes in colleges and academia. It's mildly disliked by several parts of the political spectrum for a surprisingly diverse number of reasons, but it's generally well meaning. https://en.wikipedia.org/wiki/Latinx.