From Japanese-English FreeDict Dictionary ver. 0.1: Ρ /(el)rˈo(ja)/, ρ /(el)rˈo(ja)/, ロー /ɽˈo̞o̞/ (noun (common) (futsuumeishi)) rho
Ρ /(el)rˈo(ja)/, ρ /(el)rˈo(ja)/, ロー /ɽˈo̞o̞/ (noun (common) (futsuumeishi)) rho