Chess ratings and USCF class structure

I often hear chess players referred to as "Class A" players, "experts," and "masters," but I wasn't sure exactly what these adjectives meant. Were they simply descriptive terms or were they part of a system? Did they rely on rating; FIDE or USCF? Thanks to a quick bit of Googling, now I know:

USCF Class Structure
Range Class
2400– Senior Master
2200–2399 Master
2000–2199 Expert
1800–1999 Class A
1600–1799 Class B
1400–1599 Class C
1200–1399 Class D
1000–1199 Class E

Source: About.com: Introduction to Chess Ratings

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