symbolsystem

http://www.math.wichita.edu/history/topics/num-sys.html (Inca, Ancient Egypt, Mayan, Greek Babylonian) http://mathforum.org/alejandre/numerals.html
 * Number Systems** - General Links

http://www2.uic.edu/stud_orgs/cultures/daa/ASLHistory.html http://42explore.com/signlang.htm
 * American Sign Language**

http://inventors.about.com/library/inventors/blbar_code.htm http://www.howstuffworks.com/upc.htm
 * Bar Code**

http://www.slais.ubc.ca/courses/libr517/02-03-wt2/projects/dewey/P1Section1.htm
 * Dewey Decimal System**

[|http://www-groups.dcs.st-and.ac.uk/~history/HistTopics/Egyptian_numerals.html]
 * Egyptian Numerals**

http://www.bbc.co.uk/dna/h2g2/A216073#startcontent http://www.foundalis.com/lan/grkalpha.htm
 * Greek Alphabet**

http://www.aip.org/history/curie/periodic.htm http://www.wou.edu/las/physci/ch412/perhist.htm
 * Periodic Table of Elements**

http://www.unrv.com/culture/roman-numerals.php
 * Roman Numerals**