The Romans, whose civilization is a great grandfather of most Western cultures, didn't have a concept for zero. Their numerical system looks to me like it probably arose from making tick marks for counting. For tick marks, you make a straight line to record "1." For every instance counted, you make another straight line up to four. For the fifth instance, you make a diagonal line through the first four to group them together and for 6, you start a new group of straight lines. The Wikipedia article for tally marks has an illustration of what "5" looks like in tally marks. And here are what Roman numerals look like: Roman Numerals 1 = I 2 = II 3 = III 4 = IV 5 = V 6 = VI 7 = VII 8 = VIII 9 = IX 10 = X 11 = XI 20 = XX 50 = L 100 = C 500 = D 1000 = M It was primarily a system for COUNTING and writing DATES (and their calendar had issues: October, our 10th month, translates as "month 8" and November, our 11th month, translates as "month 9"). T...