The Billiards Congress of America has no specifications on how straight a cue must be.
billiards
Billiards in the name of a popular cue sport.
Snooker and pool.
Cue Ball
Chalk.
Billiards Chalk.
"Cue' is a stick used in pool or billiards, or it can mean a prompt on stage.
Snooker or Pool
it is chalk
Cue Ball
Of course. Why wouldn't it be?
The stick to hit the ball in Snooker/Billiards