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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 the use of a thoroughfare by pedestrians.


It is used to prohibit activated mobile phones.

It is used to prohibit using water to extinguish a fire.

This sign is used to prohibit touching objects/parts of an object.


No open flame, fire, open ignition source and smoking prohibited.

This sign is used to prohibit smoking and all forms of open flame.


This sign indicates that entry to an area is prohibited.


It prohibits operating warns workers of faulty or non-functioning machinery and equipment.

This sign declares that unauthorized persons may not service machines.

To prohibit from maintenance on moving machinery.

It is used for strict smoking forbiddance.




Αυτό το αυτοκόλλητο σήμα χρησιμοποιείται σε περιπτώσεις που θέλετε να δηλώσετε πως απαγορεύεται η στάθμευση, είτε σε εξωτερικούς χώρους είτε σε χώρους εργασίας.

This sign is used to signify that parking is prohibited. (Greek language)