What is the meaning of Bezel?

The sloping edge or face on a cutting tool.

The oblique side or face of a cut gem; especially the upper faceted portion of a brilliant (diamond), which projects from its setting.

The rim and flange which encompasses and fastens a jewel or other object, such as the crystal of a watch, in the cavity in which it is set.

A formed external frame or cover affixed to a device for protective or aesthetic purpose

bezel: the area on the front of a computing device surrounding the display

Source: wiktionary.org