Is jiggers a brand name or amount of vodka?

A jigger is a small measuring cup used in bartending and cooking to measure ingredients. It is also sometimes used as a unit of measurement for alcohol, specifically for spirits. A jigger typically holds 1.5 ounces (44 milliliters) of liquid, but it can also be found in other sizes, such as 0.5 ounces (15 milliliters) or 1 ounce (30 milliliters). The term "jigger" is not a brand name, but rather a generic name for this type of measuring cup.