What Does HAT Stand For?

HAT has more than one possible meaning :

• HAT - Haitian Creole Language ISO 639 2 Code
• HAT - Highest Astronomical Tide Nautical Charts Hungarian Automated Telescope
• HAT - Histone Acetyltransferase
• HAT - Humid Air Turbine Cycle

If you know of another acronym for HAT, please suggest it as a new acronym for HAT.