The Web Component Slot element - HTML - MDN Web Docs

The Slot Definition dialog box is displayed To define a slot, you need a center curve, a planar profile, a reference element and optionally a pulling

See here, the meanings of the word slot, as video and text slot (noun

slot machine disegno What is SLOT meaning?

slot voor step slot · 1 a slit or other narrow opening, esp · 2 a place or position, as in a sequence or series · 3 an assignment or job opening; position · 4 Informal