IEC 60050-103:2009 gives the terminology relative to functions of one or more variables. Together with IEC 60050-102, it covers the mathematical terminology used in the fields of electricity, electronics and telecommunications. It maintains a clear distinction between mathematical concepts and physical concepts, even if some terms are used in both cases. Mathematical symbols are generally in accordance with IEC 60027-1 and ISO 80000-2. This standard cancels and replaces Sections 101-13, 101-14 and 101-15 of International Standard IEC 60050-101:1998.It has the status of a horizontal standard in accordance with IEC Guide 108.