This International Standard defines terms and symbols to be used in the field of reinforcing and prestressing steel for concrete. NOTE In addition to terms in English and French (two of the three official ISO languages), this International Standard gives the equivalent terms in German, Spanish and Norwegian; these are published under the responsibility of the member bodies for Germany (DIN), Spanish (AENOR) and Norway (SN). However, only the terms and definitions given in the official languages can be considered as ISO terms and definitions.