Beats can be divided into a number of notes by using tuplets. The most common is the triplet containing 3 notes.
The duplet equals 3 parts of the part the duplet is made of. Can be used in compound signatures for two notes in one beat.
The triplet equals 2 parts. Can be used in simple time signatures to produce 3 notes on one or more beats.
The quadruplet equals 6 parts. Can be used in compound time signatures to produce 4 notes in one beat.
The quintuplet equals 5 parts if they equal one beat otherwise it equals for parts.
The sextolet equals 4 parts.
The septuplets equals 6 or 4 parts like the quintuplet.
The octuplets equals 12 parts.
Nonuplets, decuplets and undecuplets equal 12 parts if the tuplet equals one beat or a whole measure, otherwise it equals 8 parts.