Following mo's idea is it the light on a motor bike?

Nope not vehicle related. There must be literally millions of these in the world although I guess designs vary.

I thought it is a Drum type car break, attached to Axle and chassis but seems I am wrong as you said, Not car related.

Part of a headphone ? ;)

Not part of a headphone.

Part of a tripod?

Not part of a tripod. (Hint: we photographers would often prefer not to see these).

Guess it as to do with darkroom!
I am in darkness and Mo is clearly leading this game.

I do not like to see a hunting rifle ! Is that a part of a rifle ?

Not photographic equipment - not any kind of weapon.