  Aluminum shape. 
I'm not sure what part of the airplane this is the complement of, but since it came from the Boeing surplus store, it must be a shape you're left over with after you cut out some important piece of airplane structure.  Either that or someone was just having fun in the machine room. 
Source: Boeing Surplus Store 
Contributor: Theodore Gray 
Acquired: 11 August, 2007 
Text Updated: 11 August, 2007 
Price: $15 
Size: 12" 
Purity: 95%
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