The Greek abacus was a table of wood or marble, pre-set with small counters in wood or metal for mathematical calculations.
ðə ɡɹˈiːk ˈæbækəs wʌzɐ tˈeɪbəl ʌv wˈʊd ɔːɹ mˈɑːɹbəl, pɹˈiːsˈɛt wɪð smˈɔːl kˈaʊntɚz ɪn wˈʊd ɔːɹ mˈɛɾəl fɔːɹ mˌæθɪmˈæɾɪkəl kˌælkjʊlˈeɪʃənz.