The holes on a belt are known as notches. When putting your belt around your waist, you secure the posts (the small fingers that go through the 'holes) inside the notches and you can make your belt tighter or looser depending on which notch you choose. There are generally five notches on a belt.
An interlocking G's Gucci belt has 3 holes
A belt wedgie is when someone slips a belt between the holes of your underwear and pulls up on the belt. If you want to give one to yourself, you can put the belt through the holes of your underwear and either pull up of fasten the belt to something and hang.
belt loop. I've always referred to that part as the belt's tongue.
awl
Holes.
a belt, fishnet stockings, jeans
They are called "black holes".
The holes on your sneakers are called 'eyes'
Holes.
holes
I do not know if they have a musical name but they are commonly just called Recorder Holes.
where are the holes located in the roof of a 1972 chevy nova for seat belt installation