[Zillini]

Each organization's founders selected their 2-3 Greek letter name. Some group's reasons for their name are confidential, some are publicly known. A "chapter" is the term used for each chartered group on each University campus of an Inter/national org.

Typically orgs give each chapter an identifying name when it is chartered and that is often based on the Greek alphabet. The founding/first chapter would be Alpha, the next Beta, all the way through Omega. After that they started with Alpha Alpha through Alpha Omega, then on to Beta Alpha through Beta Omega, and so on.