SO4 may refer to:
- National Identification Service, a department of the London Metropolitan Police which provides a range of support services on behalf of the Metropolitan Police and other police forces
- Star Ocean: The Last Hope, an action role-playing video game developed by Tri-Ace and Square Enix
- Sulfate, SO
4, in chemistry, an inorganic ion or a salt of sulfuric acid. - SO4 is an acronym for remembering the function of the fourth cranial nerve, the trochlear nerve, which control the superior oblique muscle of the eye.
- SO(4), the group of rotations in 4-dimensional Euclidean space
Topics referred to by the same termThis disambiguation page lists articles associated with the same title formed as a letter–number combination.If an internal link led you here, you may wish to change the link to point directly to the intended article. Category: