Definition of sig in English:

sig

noun

Computing
informal
  • A short personalized message at the end of an email.

    • ‘How do I tell a friend her email sig is really annoying?’

Origin

1990s: abbreviation of signature.

Pronunciation:

sig

/sɪɡ/

Definition of SIG in English:

SIG

Computing
  • Special interest group, a type of newsgroup.