There are 2 definitions of sig in English:

sig1

Line breaks: sig
Pronunciation: /sɪɡ
 
/

noun

Computing, informal
A short personalized message at the end of an email.
More example sentences
  • How do I tell a friend her email sig is really annoying?

Origin

1990s: abbreviation of signature.

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Word of the day semblance
Pronunciation: ˈsɛmbləns
noun
the outward appearance or apparent form of something…

There are 2 definitions of sig in English:

SIG2

Line breaks: SIG

abbreviation

Computing
Special interest group, a type of newsgroup.

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Definition of SIG in: