This International Standard gives a first list of terms and their definitions relating to stairs used in buildings. NOTE — In addition to the terms given in two of the official ISO languages (English and French), this International Standard gives the equivalent terms in German; these terms have been included at the request of ISO Technical Committee 59, and are published under the responsibility of the member body for Germnay (DIN). However, only the terms given in the official languages may be considered as ISO terms.