A SIG is formed by Individual Members of the Internet Society to pursue significant long-term activities that support the mission of the Internet Society.
SIGs have a global scope and have Individual Members of the Internet Society who are also members of a geographical Chapter.
You can find Internet Society Special Interest Groups (SIG) Outline here.
SIGs connection to geographical Chapters
Collaboration between geographical Chapters and SIGs is highly recommended, as the local dissemination of information and impact will be crucial to the success of the SIGs.