OK..i can't shake the feeling that these are some sort of Greek/Roman numerals...and this is what i've found. Someone please check out these pages.

http://asgle.classics.unc.edu/numerals/greek_numerals.html
http://asgle.classics.unc.edu/numerals/gnum_forms.html

Figure 11 is the C shape. It's refered to as the letter F and also in the equation IGI^2*760. it also looks like the I could = 10. These are anchient Greek numerals, not Roman as peole have been thinking.

this is what i've found...please confirm.

C (chi)= 600 or F or something with IGI^2*760
I (iota) = 10