Usage of "nav" or "navbar" instead of a navigation bar in UX design [on hold]

Do UX design use terms "nav" or "navbar" instead of "a navigation bar"? Or maybe, these terms are only used in programming and refer to "nav" and "navbar" classes used to create a navigation bar (e.g. in Bootstrap)?

Clarification: When somebody asks me to design a "nav" or "navbar", what does he have in mind? Does it mean that I have to design just a navigation bar in any style, or maybe it means I need to design a navbar like in Bootstrap or other framework.