| STO | the ermine in its brown summer coat with black-tipped tail |
|---|---|
| STO | (dialect) a short straight stick of wood |
| STO | (statistics) being or having a random variable |
| STO | a statistical process involving a number of random variables depending on a variable parameter (which is usually time) |
| STO | a variable quantity that is random |
| STO | by stochastic means |
| STO | not used technically |
| STO | an ornamental white cravat |
| STO | the merchandise that a shop has on hand |
| STO | the handle end of some implements or tools |
| STO | the handle of a handgun or the butt end of a rifle or shotgun or part of the support of a machine gun or artillery gun |
| STO | lumber used in the construction of something |