Where did math symbols come from?

Website: http://www.roma.unisa.edu.au/07305/symbols.htm#Percent
Grade: B+

If you have ever wondered where the division symbol came from, or questioned the the origin of pi this website is great. This site has a tremendous amount of information as can be seen by their index:

1. The factorial symbol n!
2. The symbols for similar and congruent
3. The symbols for angle and right angle
4. The symbol pi
5. The symbol for percent
6. The symbol for division
7. The symbols for inequality
8. The symbol for infinity
9. The symbols for ratio and proportion
10. The symbol for zero
11. The radical symbol
12. The symbols for plus and minus
13. The symbol for multiplication
14. The symbol for equality
15. The symbol for congruence in number theory
16. Complex numbers and the symbol i
17. The number e
18. The calculus symbols
19. List of ancillary symbols without explanation
20. APPENDIX --- Personalities

The information is good but could be more organized and presented in a more entertaining way.