HHMMMM....I can't think of what sound defines it for me. I'd say something to do with the military, or government, or planes, trains, or automobiles...Perhaps the sound of a Nuclear explosion, or the space shuttle launch maybe. This is a rather tough one for me, being so mechanically inclined, is not helping. I'd have been better off not knowing anything about mecahnical stuff, than knowing as much as I do. It just makes it that much harder to decide, with all of these marvelous sounds, coming from even the most mundane pieces, of mechanical wonder, invented, or heard first in the 20th century...You've got me stumped though..Good one.

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