SIG

SIG stands for

Social media, Web design and e-Mail Marketing

 * Signature

IT

 * Secure Internet Gateway

Other Meanings

 * Science Initiative Group, an international team of scientists dedicated to fostering science in developing countries
 * Special Interest Group, a technical community with a common technical interest
 * Sig, Signore or Lord in Italian
 * Sig, the Russian name for the common whitefish