A prohibition sign is a safety sign that tells you what you must not do in a particular place.

Core idea

  • It indicates that a specific action or behavior is forbidden to prevent accidents, injury, or unsafe situations.
  • Typical examples include “No Smoking,” “No Entry,” “Do Not Touch,” and “No Dogs.”

How a prohibition sign looks

  • Shape and colors: A red circular border with a diagonal red slash over a black pictogram on a white background.
  • The pictogram shows the banned action (for example, a cigarette for “No Smoking”).
  • Sometimes short text like “No Entry” or “Do Not Touch” appears underneath to reinforce the message.

If you are choosing from options

When you see multiple choices, the correct description of a prohibition sign is the one that says something like:

“A circular sign with a red border and diagonal slash on a white background, showing what action is not allowed.”

That type of wording matches the standard description of a prohibition sign used in safety regulations worldwide.

Information gathered from public forums or data available on the internet and portrayed here.