"Seal" or "SEAL" may refer to articles connected to a variety of meanings of the word:
"A marine mammal:"
*"Seal", a large marine mammal: see pinniped within which there are three main groups:
**Earless seals (or true seals), members of the family Phocidae
**Eared seals (or walking seals), members of the family Otariidae, which includes:
***Fur seals, subfamily Arctocephalinae
***Sea Lions, subfamily Otariinae
*Seal hunting, both personal and commercial hunting of seals
* Gweek Seal Sanctuary, a charity funded sanctuary for injured seal pups on the banks of the Helford River, Cornwall, UK
* Natureland Seal Sanctuary, an animal attraction in Skegness, Lincolnshire, England
*Seal brown is a rich dark brown color ''RGB(50, 20, 20)'' (from the colour of dyed ''Fur seal'' fur)
"Fixing or closing to give a tight fit:"
*Seal (mechanical), a device to contain pressure, or exclude contamination from an enclosure
*Bridgman seal, named after Percy Williams Bridgman, seals a high pressure volume by the use of an unsupported area to create a higher pressure between two pistons