What is "klef"

KLEF (98.1 FM) is a commercial classical music radio station in Anchorage, Alaska. The call sign refers to musical terminology, specifically the word clef. It celebrated 25 years on the air in September, 2013.

The KLEF call letters were previously used during the 1970s and early 1980s by the Houston station now known as KTBZ while it was a classical music station.