It's the chemical symbol for bismuth
[DOC] [TLE] Periodic Table of Elements: Bismuth - Bi (EnvironmentalChemistry ... [PAR] Comprehensive information for the element Bismuth - Bi is provided by this page 
including scores of ... Asbestos, a Brief History its Uses & Health Risks  Asbestos, 
its Chemical & Physical Properties .... Comprehensive data on the chemical 
element Bismuth is provided on this page; including ... Atomic Structure of 
Bismuth.