 nihon-siki チ "ti", or they apply some Western graphotactics, usually the English one, to the common Japanese pronunciation of the kana signs, e.g.Hepburn-shiki チ "chi".Both approaches conceal the fact, though, that many consonant-based katakana signs, especially those canonically ending in "u", can be used in coda position, too, where the vowel is unvoiced and therefore barely perceptible.