What town is HTX?

Excuse me, I'm curious to know, what exactly is the name of the town that's being referred to when someone says 'HTX'? Is it a popular nickname for a well-known city, or perhaps a lesser-known location that's unique in some way? I'm trying to get a clearer understanding of the context in which 'HTX' is used, and whether it's a widely recognized abbreviation or something more specific to a certain region or industry. Could you please elaborate on this for me?