XOR operator
Short for eXclusive OR, the XOR operator is a Boolean operation used in database searches and other searches that returns a TRUE value only if a document contains only one of the XOR operators.
For example:
Computer XOR Help
The above example returns results of documents or a value that contain either "Computer" or "Help", but would not return the results if the documents or value contains both of these words.
Also see: Boolean, Programming definitions