What is "knac"

KNAC-FM (branded as Pure Rock 105.5 KNAC) was a Los Angeles heavy metal FM radio station licensed to Long Beach, originally owned by Fred Sands, broadcasting at 105.5 MHz from January 8, 1986 to February 15, 1995; about two weeks after the sign-off, it was replaced by the Spanish-language radio station known as KBUE (Que Buena). In February 1998, however, KNAC was revived as an internet-based radio station. Prior to 1986, KNAC had existed in several different formats, including " freeform" and "Rock N Rhythm", which was a new wave/ alternative rock station.