punch-hole

Noun

punch hole (plural punch holes)

1. A marker on a frame of film, originally a hole literally punched through the film, signalling to the projectionist that the reel is due to be changed.

   Synonyms:

   cigarette burn

2. (footwear) A small, round hole created in the shoe, typically on the vamp or quarter, used for decorative purposes or to enhance ventilation.
3. A small, round section placed near the top of the screen of some smartphones, housing the front-facing camera while maximizing screen space.