Dictionary.net

A supercomputer developed at BBN Technologies,named after the "butterfly" multi-stage switching networkaround which it was built. It could have up to 512 CPUsconnected to allow every CPU access to every other CPU'smemory, albeit with about 15 times the latency than for itsown. The earlier GP-1000 models used up to 256 Motorola68020s. The later TC-2000 models used up to 512 Motorola88100s.Language developed for, or ported to, the BBN Butterfly wereButterfly Common LISP, Butterfly Scheme, Delirium, andMultiScheme. (http://paralogos.com/DeadSuper/Misc/BBN.html).