This document describes a recommended syntax for writing the string representation of unit labels (VOUnits). In addition, it describes a set of recognised and deprecated units, which is as far as possible consistent with other relevant standards (BIP
M, ISO/IEC and the IAU). The intention is that units written to conform to this specification will likely also be parsable by other well-known parsers. To this end, we include machine-readable grammars for other units syntaxes.
