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✅ (PSS) Prohibition Signs

Prohibition Safety Signs – Meaning & Symbols

Prohibition safety signs are safety signs used to indicate actions that are not allowed in a specific area. They are designed to prevent unsafe behavior and reduce the risk of accidents in workplaces, industrial facilities, and onboard vessels.

The purpose of prohibition signs is to clearly communicate restrictions using standardized symbols that are immediately recognizable. These signs typically use a red circular design with a diagonal line and cover common instructions such as no entry, no smoking, or no operation.

Prohibition signs are part of essential safety signage systems used across marine and industrial environments, ensuring clear visual communication and consistent safety practices.

To prohibit stepping onto a surface.

This sign is used to prohibit metallic articles or watches.

To prohibit use of lift in the event of fire.

To prohibit the obstruction of a designated clear area.

This sign is used to prohibit weapons.

The function of sign is to prohibit smoking beyond this point.


This sign is used to prohibit matches.

This sign is used to naked lights.

This sign is used to prohibit no hot work during gas freeing or cargo operation.

The function of sign is to prohibit hot work.


This sign is used to prohibit entry.


This sign is used to signify a prohibited action.