Nosing
This piece can stick out or just be an edge on stairs, tabletops and more
"Nosing" usually refers to the edge of a stair tread that extends beyond the riser; it can also refer to a strip added to the edge of a board to provide a protective edge or a decorative look, or to conceal wood on the edge or end. It traditionally is the leading or front edge of a piece, but the term is often used also for a strip added on all sides.
The dark wood of these stairs stands in stark contrast to the white wall and helps to clearly show the nosing at the edge of the tread.
Nosing is often used to conceal the edges of plywood, rather than a strip of veneer.