What does S stand for?

What does S mean?

S	Support Governmental » Military
S	Second Governmental » NASA
S	These Computing » Texting
S	State Miscellaneous » Unclassified
S	Special Miscellaneous » Unclassified
S	South Regional » States
S	Shares Miscellaneous » Unit Measures
S	School Community » Educational
S	Small Miscellaneous » Clothes
S	Size Miscellaneous » Clothes
S	Subject Governmental » US Government
S	Standard Governmental » US Government
S	Step Academic & Science » Architecture
S	Simply Business » Products
S	Steve Miscellaneous » Names and Nicknames
S	Scott Miscellaneous » Names and Nicknames
S	Soft Miscellaneous » Unclassified
S	Single Internet » Chat
S	September Miscellaneous » Months Abbreviations
S	Short Academic & Science » Physics
S	Side Academic & Science » Mathematics
S	Source Computing » Assembly
S	Simple Business » General
S	Student Academic & Science » Universities
S	Server Computing » Networking