finger hole
Refers to a hole designed for a finger, such as on a flute, recorder, bowling ball, or similar object.
If you don't press the finger holes of the recorder firmly, you won't get a clean sound.
A bowling ball has three finger holes.
Standard kanji spelling for finger holes in musical instruments, sports equipment, etc.
Alternate kanji spelling using 孔 (hole); less common but still seen.
Compound of 指 (yubi, 'finger') and 穴 (ana, 'hole'). The reading yubi-ana is straightforward.