")+(" was the symbol for the former
Hono Intelligence Service 1901, an Argentinian
cult with a setup that, in terms of sheer weirdness, rivaled
Jim Jones and
Heaven's Gate.
Contrary to the name, the cult was founded in
Canuelas in 1973 by a man named
Carlos Jerez. Jerez opened a "
cancer center" with a 1950s-style
flying saucer UFO out front.
Jerez somehow got a reputation as a miracle healer, and had hundreds of patients. He claimed to come from another planet. It wasn't long before the Argentinian government got curious and began investigating; they found out Jerez was medically incompetent. Jerez soon disappeared.
The )+( symbol is also identified with the
UMMO Letters outer-space cult in Europe.
Resources:
http://www.strangemag.com/ummo.html