| S | the 19th letter of the Roman alphabet |
|---|---|
| S | a unit of conductance equal to the reciprocal of an ohm |
| S | the cardinal compass point that is at 180 degrees |
| S | an abundant tasteless odorless multivalent nonmetallic element |
| S | 1/60 of a minute |
| S | a wrench with an S-shaped handle |
| S | a double curve resembling the letter S |
| S | United States writer of detective novels (1888-1939) |
| S | the procedure that would normally be followed |
| S | standard temperature and pressure |
| S | a high-performance four-wheel drive car built on a truck chassis |
| S | the ratio of signal intensity to noise intensity |