So in the case of a differential SCSI bus, it is possible to terminate all 18 spare signal wires with just one resistor.
sˌoʊ ɪnðə kˈeɪs əvə dˌɪfɚɹˈɛnʃəl skˈʌzi bˈʌs, ɪɾ ɪz pˈɑːsᵻbəl tə tˈɜːmᵻnˌeɪt ˈɔːl ˈeɪtiːn spˈɛɹ sˈɪɡnəl wˈaɪɚz wɪð dʒˈʌst wˈʌn ɹᵻsˈɪstɚ.