Orchestra Hit

(Waveform of an orchestra hit played on a Yamaha MU50 - XG mode)

An orchestra hit, also known as an orchestral hit, orchestra stab, or orchestral stab, is a sound created through the layering of the sounds of a number of different orchestral instruments playing a single staccato note or chord. The orchestra hit sound was propagated by the use of early samplers, particularly the Fairlight CMI where it was known as the ORCH5 sample. The sound is used in pop, hip hop and techno genres to accentuate passages of music.

[Wikipedia]

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I've been playing with this all day:

http://free-loops.com/6976-orchestra-hit-4.html