Term	Full Form | Definition | Meaning
s	second
S	South
S	Sulfur
S	Entropy
S	Siemens
S	Spin
S	Serine
S	Socialdemokraterna
S	Small
S	Sheffield
s	strikethrough
S	Sonder
S	Sport
S	Synthesis
S	Shrirangapattana
S-Video	Separate Video
S/N	Serial Number
S/N	Signal-to-Noise
S/N	Supernatant
S/o	Son of
S/O	Sold-Out
S/O	Shout-Out
S/O	Shipping Order
S/O	Significant Other
S/O	Security Officer