Brahmi numeral signs, mixed ciphered/multiplicative-additive system, table based on Stephen Chrisomalis (Q59611138), Numerical notation: A Comparative History, Cambridge [et al.]: Cambridge University Press, 2010, ISBN 978-0-521-87818-0, p. 189, and Richard Salomon, Indian Epigraphy, New York/Oxford: Oxford University Press, 1998, ISBN 0-19-509984-2, p. 58
Own work
Otfried Lieberknecht