Return-Type Stairs : Conventional stairs, in which the user traverses one-half the distance to the next higher floor, encounters a landing, then reverses direction to climb the remaining distance
Ralph W. Burklin & Robert G. Purington, Fire Terms: A Guide to Their Meaning and Use, National Protection Association, Boston, MA 1980 USA. (Guide: Meaning and Use, Nat Prot Association Fr Srvc - Amer) {457}