History of Technology in India, Vol. I: From Antiquity to c. 1200 A.D. v1.c38.s1.t1.32

Mahāvīra has used smaller units of *aṅgula* as 1 *aṅg* = 8⁸ *paramāṇu*, *aṇu* is added between *paramāṇu* and *trasareṇu*.