What city does HTX stand for?

Could you please clarify the context in which "HTX" is being used? As it stands, "HTX" could represent a variety of things, including a company name, an acronym for a specific technology or service, or even a nickname for a particular city. However, without more information, it's difficult to definitively state what city "HTX" stands for. If you could provide some additional context or specify which industry or field "HTX" is associated with, it may help narrow down the possibilities and allow for a more accurate answer.