1S or 1s may refer to:
*
1s electron, in an atomic orbital
*
Sabre (computer system)'s IATA code
* 1S, a series of
Toyota S engines
* SSH 1S (WA); see
Washington State Route 502,
Washington State Route 503
* One
shilling (British coin)
See also
*
Shilling
The shilling is a historical coin, and the name of a unit of modern currency, currencies formerly used in the United Kingdom, Australia, New Zealand, other British Commonwealth countries and Ireland, where they were generally equivalent to 1 ...
*
Second
*
Ones (disambiguation)
*
S1 (disambiguation)
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