A

Alphabetical index

A B C D E F G H I J K L M
N O P Q R S T U V W X Y Z

abbreviations

The names of metric units should not be abbreviated. Use symbols: 25 m not 25 mtrs.

ampere

Unit of measurement of electrical current, symbol: A.

are

Obsolete unit of measurement of area, equal to 100 m2.

atto

Prefix for a subdivision of 10-18, symbol: a.