December 2005, V4#12: Define Thursday, Jan 29 2009 

Basic Size: Standard sheet size per type of paper that determines the weight.

Basis weight: “Weight” of a given paper determined by the weight of 500 basic size sheets.

Paper Basis Weight: designation given to a sheet of paper in terms of weight of 500 sheets (1 ream) in the standard size.

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November 2005, V4#11: Define Thursday, Jan 29 2009 

Point: Unit of thickness, one thousandth of an inch (0.001″).

Ream: 500 sheets of paper, regardless of size, weight, or grade.  However, many refer to wrapped paper groups as a ream, such 250 index stock, 100 specialty paper, etc.