nosing

Standards

the leading edge of a stair tread

Source - AS 1657:2018: Design, construction and installation

Standards

a device intended to improve the slip resistance of the leading edge of a step

Source - AS 4586-2013: Slip resistance classification of new pedestrian surface materials

HB50

semicircular or rounded projecting part of a window board, stair tread, or other member
See Figure A.32

Figure A.32: Stair construction

HB50

<moulding> moulding with a projecting rounded edge
See Figure A.80

Figure A.80: Timber mouldings