fɔːɹ ˌɛni , ðə kˈæɹɪktɚz ɪf ænd ˈoʊnli ɪf ænd ɑːɹ ɔnðə sˈeɪm ˈɔːɹbɪt ʌvðə wˈeɪl ɡɹˈuːp ʌv , wˌɛɹ ɪz ðə hˈæfsˈʌm ʌvðə pˈɑːzᵻtˌɪv ɹˈuːts, sˈʌmtaɪmz nˈoʊn æz ðə wˈeɪl vˈɛktɚ.
For any , the characters  if and only if  and  are on the same orbit of the Weyl group of , where  is the half-sum of the positive roots, sometimes known as the Weyl vector.