Knight Bachelor

Noun

 * 1)  A man who has been knighted by the monarch but not as a member of one of the organized orders of chivalry; the lowest rank of knight in the British honours system.

Usage notes

 * The post-nominal letters "Kt" are sometimes erroneously (and rarely officially) used by holders of this title.
 * There is no direct equivalent rank for females, women are typically appointed Dames of the British Empire instead.