Reduction or symbol for
hyperopia or hyperopic; horizontal; Hauch;
Holzknecht unit; henry,
unit of
electrical inductance; hydrogen; the Fraunhofer
line at
lambda 3968 due to calcium; histidine;
magnetic field power; heroin.
Symbol for enthalpy,
heat content, in the
equation for
free energy.
Symbol for hecto-; height; hour.
Symbol for Planck's constant; h = h/2π.
H+ is the symbol for
hydrogen ion, the proton.