What does STEL stand for?

SA Holdings - NASDAQ symbol (SAG)

SA Telecommunications - NASDAQ symbol

SA Telecommunications, Inc. - NASDAQ symbol (SAG)

Short-Term Exposure Limit - Environmental chemistry

Short-Time Exposure Limit - Petroleum engineering

Society of Telegraphic Engineers - British

Stay Time Exposure Level - Office of Environmental Management, Department of Energy (DEEM)

Stellent - NASDAQ symbol

Structure Tests, English Language - Educational test

Studenta Tutmonda Esperantista Liga - World League of Esperanto-Speaking Students