At the heart of the SI is a short list of base units defined in an absolute way without referring to any other units. The base units are consistent with the part of the metric system called the MKS system. In all there are seven SI base units: 1  the meter for distance, 2  the kilogram for mass, 3  the second for time, 4  the ampere for electric current, 5  the kelvin for temperature, 6  the mole for amount of substance, and. 7  the candela for intensity of light.
AA as an academic degree stands for Associates of Arts. The difference between Associates of Arts, Associates of Science, and Associates of Applied Science: Associate degrees fall into three main areas. Associates of Arts (AA)
A.A. degree is a common term for the Associate of Arts college degree. The A.A. degree is a two-year undergraduate academic degree offered by community colleges, junior colleges, vocational schools and technical colleges in the United States.