34 Pa. Code § 47.221
The following words and terms, when used in this subchapter, have the following meanings, unless the context clearly indicates otherwise:
Balcony-A working platform projecting from a wall.
Handrailing-A single pole, bar or pipe supported on brackets from a wall or partition.
Oiling platform-A raised flooring constructed for the purpose of oiling machinery.
Platform-A raised working floor or stage.
Railing-A vertical barrier erected along the exposed edges of open-sided floors, working platforms, runways, balconies and openings in walls, floors and ground levels.
Runway-A stationary incline or ramp provided as a means of ascent and descent from one level to another.
Toeboard-A board or plank set on edge immediately under a railing at floor level.
34 Pa. Code § 47.221