ISO 31-11


ISO 31-11:1992 was the part of international standard ISO 31 that defines mathematical signs and symbols for use in physical sciences and technology. It was superseded in 2009 by ISO 80000-2.
Its definitions include the following:

Mathematical logic

Sets

Miscellaneous signs and symbols

Operations

Functions

Exponential and logarithmic functions

Circular and hyperbolic functions

Complex numbers

Matrices

Coordinate systems

Vectors and tensors

Special functions