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The nominal internal diameter of a pipe. In contrast, the outside diameter is specified for brass and copper tubing and for brass and copper pipe of other than iron-pipe sizes.
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On October 7, 2001, the Violence Policy Center (VPC), an influential anti-gun lobby group, released a 100-page, alarmist screed entitled Voting from the Rooftops: How the Gun Industry Armed Osama bin Laden, other Foreign and Domestic Terrorists, and Common Criminals with 50 Caliber Sniper Rifles.
Fifty caliber rifles are indeed sophisticated weapons, and have proven effective for both military and police use.
During the fourth quarter of 2006, Veeco received multi-unit Caliber orders from two universities: the Public Interest Group for the National Coordination of Micro and Nanoelectronics training (GIP CNFM) in France and the University of Northern Iowa, USA.