It depends who you ask.
According to the NRA, the first rule of gun safety is "Always point your gun in a safe direction."
According to the Gunsite safety rules, the first rule of gun safety is "Treat every gun as if it were loaded" or more simply "Every gun is always loaded."
As a very general rule, the NRA safety rules are more popular among competitive non-tactical shooters (bulls-eye matches for instance) and the Gunsite safety rules are more popular among tactical shooters and instructors.
The NRA is a very respected gun organization, and Gunsite is one of the premier, if not THE premier training organization in the U.S. and its founder Jeff Cooper was considered by many, many shooters as the Top Gun guru.
Who first suggested Fleming's left hand rule?
Go to higher grounds.
use electro-static discharge
A safety rule is a rule that is followed to try to avoid an accident.
Within the context of post-modern and modern portfolio theory, a safety-first rule ... A safety-first rule is a form of margin of safety that can be used when creating a ... The differences between risk, as defined by the standard deviation of returns, ...
While they may be indifferent orders, a generally accepted first rule is: Treat ALL firearms as if they were loaded until YOU have checked it and verified that it is not.
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Safety is the biggest rule in Gymnastics.
The most important rule for health and safety at work is "Be aware and alert."
The safety symbol that uses the image of a hand is used to indicate that hand protection (gloves) is appropriate.
Wear safety goggles, do not mix acids unless instructed to do so.
use oil