What is a Pica?

Pica is pronounced (paika) is a typographic unit of measure and responds to 1/72nd of its respective foot, and there fore to 1/6th of an inch. Pica contains 12 point units of measure. Now, the other meaning for pica, is when someone has an eating disorder in which he/she ingests non-food items, such as dirt, metal or paper, and is common mostly among pregnant woman and children and persons that are mentally retarded.