sig file ˈsig file also ˈsignature file noun [countable]
COMPUTING a block of writing that is added electronically at the end of an email as a way of signing it, usually containing some short information about the sender
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sig file UK US noun [C] (also signature file) IT
► in an email, a few lines of information after a signature, giving information about the person who sent the email. When someone creates a sig file, it is added automatically each time they send an email: »
I created a new sig file for my new messages, replies, and forwards.
Financial and business terms. 2012.