The glans penis (or simply glans) is the sensitive bulbous structure at the distal end of the penis. It is also commonly referred to as the "head" of the penis.
Slang terms include "helmet", "nob" (or "knob"), and "bell end", and all refer to its distinctive shape. The glans penis is anatomically homologous to the clitoral glans of the female. When the intact penis is flaccid it is wholly or partially covered by the foreskin. Together, the mucosal tissues of the glans and inner foreskin protect and lubricate each other, much like the eyelid protects the eye. In circumcised men, most of the foreskin is removed, and the glans becomes dry and keratinized.