Also known as sodium chloride, salt is a common crystalline mineral found on Earth. It is used as a seasoning, and was once used as a food preservative.

In 2266, the shape shifting creature of M-113 craved salt to survive and could kill at will in order to get its requisite salt.

In 2369, Sisko tries to use the myriad outcomes represented by simple salt's form when combined with other materials to serve as examples for how Dax could be a totally separate person when hosted by hosts Curzon and Jadzia.