Abbreviation for Printed Circuit Board. Refers to the technique used to manufacture modern electronic circuit boards. The conductive “traces” are effectively printed onto the board, which is made of an insulating material.

It is also an abbreviation for polychlorinated biphenyl; any of a group of toxic, chlorinated aromatic hydrocarbons used in a variety of commercial applications, including paints, inks, adhesives, electrical condensers, batteries, and lubricants; known to cause skin diseases and suspected of causing birth defects and cancer.