The Blue Öyster Cult is a classic rock outfit that found most of it's popularity in the 70's and 80's. They released such famous hits as (Don't Fear) The Reaper, Burnin' For You and Shooting Shark....
The "Blue Oyster Cult Symbol" is technically the roman symbol for Chronos, who is a corn god or harvest god (Hence the sickle), he also has some connection to time. This is where the symbol crosses...