h (hour)

H (hydrogen [element])

H (history)

H flu (hemophilus influenzae)

H-FABP (heart-type fatty acid binding protein)

h. (hour)

h.s. (bedtime (L. hora somni))

h/a (headache)

H/H (Henderson-Hasselbalch equation)

H/H (hemoglobin/hematocrit)