pinhole
A very small hole, often in a thin material or used in optics.
ピンホールカメラで写真を撮るのは面白い。
Taking photos with a pinhole camera is interesting.
pinholing (printing defect)
Technical term in printing for small holes or voids in a printed layer.
印刷工程でピンホールが発生すると、品質が落ちる。
If pinholing occurs during the printing process, quality decreases.
Loanword from English 'pinhole'.