Unit of measure is a term used to describe the standard unit of measurement for a particular quantity. The most common units of measure are MIL (3 letters), PINT (4 letters), YARD (4 letters), and MICRON (6 letters). MIL is a unit of length equal to one thousandth of an inch, PINT is a unit of volume equal to one eighth of a gallon, YARD is a unit of length equal to three feet, and MICRON is a unit of length equal to one millionth of a meter.