ゼット

Etymology
Borrowed from. The English word-final voiced sound is sometimes transcribed as if it was voiceless, as tto, instead of the usual (and more accurate) ddo, because Japanese didn’t have a voiced geminate. Perhaps also influenced by, which ends in a voiceless sound. Some English words ending in the voiced sound are also transcribed as if they ended in the voiceless sound  (e.g.: ..