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ICS(1) (ICalendar Schedule) A calendar invitation message file format. See iCalendar.
(2) (Ice Cream Sandwich) See Android versions.
(3) (Internet Connection Sharing) A Windows Internet sharing feature that enables the Internet connection on a computer to be shared with other computers. Introduced in Windows 98, ICS software performs the functions of a router, which is commonly used to connect multiple computers to the Internet. See Internet sharing and wireless router.
(4) (Internet Chess Server) A server that allows people to play chess over the Internet. ICS input and output is normally text, but XICS provides a graphical interface. See XICS.