As the name suggests, these coins bear the symbols of various types, punched on pieces of silver of specific weight. Punch-marked coins are marked with 1-5 (and sometimes more) marks representing various symbols.They are broadly classified into two periods : the first period (attributed to the Janapadas or small local states) and the second period (attributed to the Imperial Mauryan period). The motifs found on these coins were mostly drawn from nature like the sun, various animal motifs, trees, hills etc. and some were geometrical symbols.
Ancient Indian coinage was based on `Karshapana' unit that consists of 32 rattis (3.3 grams of silver) and a 'Ratti' is equivalent to 0.11 gms.