This International Standard defines terms and symbols relating to castors and wheels. NOTE 1 “Castors and wheels” is the English expression; in other languages the expression may be reversed, for example in French “Roues et roulettes”. NOTE 2 In addition to terms in English and French (two of the three official ISO languages), this International Standard gives the equivalent terms in German, Finnish, Italian, Dutch and Swedish; these are published under the responsibility of the member bodies for Germany (DIN), Finland (SFS), Italy (UNI), Netherlands (NEN) and Sweden (SIS). However, only the terms and definitions given in the official languages can be considered as ISO terms and definitions.