What is the abbreviation for kilogram?

The abbreviation for kilogram is "kg." This abbreviation is derived from the metric system, which uses standardized prefixes and symbols to represent different measurements. The prefix "kilo-" means one thousand, so a kilogram is equivalently one thousand grams. The "g" represents grams, which is why "kg" is the specific abbreviation for kilogram.

In the context of medical and scientific measurements, using the correct abbreviations is crucial for clarity and precision, as it helps communicate measurements effectively across various disciplines. Other options represent different units of measurement: "g" stands for grams, "lb" is used for pounds, which is a unit of weight in the customary system, and "pt" refers to pints, which is a measurement of volume. Each of these abbreviations serves a distinct purpose in their respective contexts.