1) Horizontal coupling plane 
Healthcare proxy. A type of advance directive that gives a person (such as a relative, lawyer, or friend) the authority to make healthcare decisions for another person. It becomes active when that person loses the ability to make decisions for himself or herself. Also called healthcare proxy.
Health Communication Partnership
Histone-rich calcium-binding protein. Major protein of sarcoplasmic reticulum, where it may play a role in sequestering calcium ions. Highly acidic, with multiple repeats of highly conserved domains, believed to be responsible for calcium binding.
horizontal coupling plane (for ESD testing)
High Card Points. The most common hand evaluation system is one where an Ace is worth 4 points, a King 3, a Queen 2, and a Jack 1.
Handicap