Historical
BS ISO 80000-2:2009
Quantities and units. Mathematical signs and symbols to be used in the natural sciences and technology (British Standard)
ISO 80000-2:2009 gives general information about mathematical signs and symbols, their meanings, verbal equivalents and applications.
The recommendations in ISO 80000-2:2009 are intended mainly for use in the natural sciences and technology, but also apply to other areas where mathematics is used.
British Standards Institution [bsi]