Speaking Signs - Allowed vs. Prohibited Communication Symbols #3356488 (License: Personal Use)

The top-left icon shows a person speaking with sound waves inside a red circle, indicating permitted speech. The other three icons use red prohibition symbols-a diagonal slash, a second overlapping slash, and a full X-to indicate increasing levels of restriction against speaking. All follow ISO-style safety sign conventions for clarity in public, medical, or quiet zones.

Used on websites about signage standards, workplace safety, library rules, or noise control policies; matches user intent to understand visual communication of speech restrictions in public spaces.