Which abbreviation signifies half?

The abbreviation that signifies half is "ss." In medical terminology, particularly in the context of medication dosages, "ss" is derived from the Latin term "semis," which literally means half. This convention is often used when prescribing medication, especially when specifying a reduced or fractional dose.

Understanding medical abbreviations is crucial for proper communication in healthcare settings, as it ensures clarity and accuracy in patient care and medication administration. While "1/2" explicitly indicates half in a numerical format, it doesn’t represent an abbreviation. The other options, "hp" for "high potency" and "half" written out, do not reflect the abbreviation usage commonly adopted in medical contexts. Thus, "ss" is the correct choice for the standard abbreviation that means half.