opinion varies concerning Crackle's occupation, but Snap is always portrayed as a baker and Pop as a soldier.
Snap is the oldest and the leader of the group. He solves the problems his two brothers create and wears a baker’s hat.
Crackle is the good-hearted, fun middle child. He gets stuck keeping order between his brothers’ personalities and wears a red-and-white-striped stocking cap.
Pop is the mischievous, clumsy younger child. He plays jokes, doesn’t take things seriously and wears a military hat.
The Elves' large ears and noses have been reduced and softened over the years.
In kinematics, the term "snap" is sometimes used to refer to the fourth derivative of position relative to time; "crackle" and "pop" have - facetiously - been suggested as names for the fifth and sixth derivatives.