.S may refer to:
* .S (source file), a file extension for Assembly language source files, particularly associated with the
GNU Assembler
The GNU Assembler, commonly known as gas or as, is the assembler developed by the GNU Project. It is the default back-end of GCC. It is used to assemble the GNU operating system and the Linux kernel, and various other software. It is a part of ...
*
Dot-S
Dot-S (ドッツ, styled as .S) also known as Dot-Pin is a toy, similar to a Lite-Brite, created in 2005 by Japanese company Tomytec. The toys allow for the creation of pictures by placing colored pegs into holes in one or more boards. Many sets ...
, a lighted toy
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