Archaeologists have found ancient disks of various sizes that are thought to have been used as counters.
ˌɑːɹkiːˈɑːlədʒˌɪsts hæv fˈaʊnd ˈeɪntʃənt dˈɪsks ʌv vˈɛɹiəs sˈaɪzᵻz ðæt ɑːɹ θˈɔːt tə hɐvbɪn jˈuːzd æz kˈaʊntɚz.