The term brain refers to more than one thing:

• The brain is an organ part of many vertebrate's nervous systems.
• Brain is the name of a commune in the Côte-d'Or département in France.
• Brain is also the name of one of the lab mice in the cartoon Pinky and the Brain.
• Brain is also the name of the dog in the cartoon Inspector Gadget.
• Brain is also an often misspelled typo of the name Brian.
• (c)Brain is a computer virus.
• S A Brain is a brewery in Wales.