The abbreviation "HD" basically stand for High Definition.
HD stands for Hold for a reliever
High Definition
Heavy duty
Heavy Duty
Hydrogen
Math is an abbreviation of mathematics: it is not an acronym. So the h does not stand for anything!
They stand for:-HeadHeartHandsHealth
Howard.
it is a silent letter
The H in H-Bomb stands for Hydrogen.
H stands for hour.See the Related Link