When I hear the word "loop", I naturally think of the big O-shaped thing on coasters. (That is, when not programming or something like that. You know what I mean.) However, if you talk to members of the general public, many tend to think of loops as anything that goes upside-down. One great example of this is Steel Phantom.
"I hear they're taking out all the loops!" ;)
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Matt Lynch
Co-Webmaster, Kennywood Boulevard
http://kennywood.coasterbuzz.com