noentry
Noentry is a term that conveys the prohibition of entering a place or area. It is used in signage, access control, and related rules to indicate restricted access. The concept can appear as a label, a symbol, or as part of a combined indicator.
In signage, the most common no-entry symbol is a red circle with a white horizontal bar across
Applications of no-entry indications include traffic control (to prevent driving the wrong way on one-way streets),
Standards and legality vary by country. In the United States, the MUTCD defines a “Do Not Enter”
Beyond physical signs, the no-entry concept also appears in digital and organizational contexts as a metaphor
See also: Do Not Enter; No Entry sign; Access control; Traffic sign.