ðə lˈɔŋɡɪst ˈɛlɪmənt ɪz ðə sˈɛntɹəl ˈɛlɪmənt wˈʌn ɛksˈɛpt fɔːɹ,  fɔːɹ ˈɛn ˈɑːd,  ænd fɔːɹ pˈiː ˈɑːd, wˌɛn ɪɾ ɪz wˈʌn mˌʌltɪplˈaɪd baɪ ðɪ ˈɔːɹdɚ tˈuː ˌɔːɾoʊmˈɔːɹfɪzəm ʌvðə kˈɑːksɛɾɚ dˈaɪəɡɹˌæm.
The longest element is the central element –1 except for  (),  for n odd,  and  for p odd, when it is –1 multiplied by the order 2 automorphism of the Coxeter diagram.