pencil test

Noun

 * 1)  An early version of an animated scene, consisting of rough sketches that are photographed or scanned.
 * 2) An informal test of whether a girl needs to wear a bra, based on whether a pencil placed in the inframammary fold stays in place or not.
 * 3)  A method of determining racial identity during apartheid, based on how easily a pencil pushed through a person's hair can be removed.