The Whetstone of Witte

Recordian notation for exponentiation, however, differed from the later Cartesian notation $p^q = p \times p \times p \cdots \times p$. Recorde expressed indices and surds larger than 3 in a systematic form based on the prime factorization of the exponent: a factor of two he termed a zenzic, and a factor of three, a cubic. Recorde termed the larger prime numbers appearing in this factorization sursolids, distinguishing between them by use of ordinal numbers: that is, he defined 5 as the first sursolid and 7 as the second sursolid.[4] He also devised symbols for these factors: a zenzic was denoted by z, and a cubic by &. For instance, he referred to p8=p2×2×2 as pzzz (the zenzizenzizenzic of p), and q12=q2×2×3 as qzz& (the zenzizenzicubic of q).[5]