Blissymbol Dictionary
   Comprehensive online dictionary of the Blissymbolics Language - used by linguistically disabled persons.
   http://www.symbols.net/blissymbolics/dictionary/

Dictionary of Symbolism
   An online aid for exploring the meanings of symbols.
   http://www.umich.edu/~umfandsf/symbolismproject/symbolism.html/

Symbols.com
   The world's largest online encyclopedia of graphic symbols, ranging from ideograms carved in mammoth teeth by Cro-Magnon men, to hobo signs and subway graffiti.
   http://www.symbols.com/