ɐmˈɛɹɪkən nəmˈɛŋklətʃɚ, ˈɔːlsoʊ jˈuːzd ɪn jˈʊɹɹəp, jˈuːzd ɐ nˈʌmbɚ tʊ aɪdˈɛntᵻfˌaɪ ðə hˈiːɾɚ vˈoʊltɪdʒ, ðˈɛn wˈʌn ɔːɹ tˈuː siːkwˈɛnʃəli ɐsˈaɪnd lˈɛɾɚz, ðˈɛn ɐ nˈʌmbɚ spˈɛsᵻfˌaɪɪŋ ðə tˈoʊɾəl nˈʌmbɚɹ ʌv ᵻlˈɛktɹoʊdz plˈʌs wˌʌn.
American nomenclature, also used in Europe, used a number to identify the heater voltage, then one or two sequentially assigned letters, then a number specifying the total number of electrodes plus one.