ro || from ku.ro “to count” | *plus
KN V 280 (Scribe 124)
ro appears to be founded in the LinA ku-ro, which has long been understood as “total”. Cf. Jap. kuru “to count”. Note that the syllable /ku/ is transformed in the rough breathing of the Greek letter /ρ/ (rho), which should be transcribed as /hro/. Cf. a similar shift from LinA ku.ru.ma [HT 115] > Jap. kuruma 車 “chariot, wheel” and L. carrum “chariot” > Gr. ῥῦμα (hruma) “that which is drawn”. In context, AB *002 RO is transcribed as “X”, but the sign’s association with accounting provides strong evidence for its basis as the mathematical “+” sign.