Attic numerals comprised another system that came into use perhaps in the 7th century BC. They were acrophonic, derived (after the initial one) from the first letters of the names of the numbers represented. They ran  = 1,  = 5,  = 10,  = 100,  = 1,000, and  = 10,000. The numbers were represented by the letter with minuscule powers of ten written in the top right corner: , , , and . One-half was represented by ⊂ (left half of a full circle). The same system was used outside of Attica, but the symbols varied with the local alphabets: in Boeotia, was 1,000.