The spelling of the word "TISE" can be explained through its International Phonetic Alphabet (IPA) transcription, which is /taɪz/. The first two letters "TI" represent the diphthong sound of "ai" as in "tide". The letter "S" represents the voiceless alveolar sibilant sound, and the final letter "E" indicates that the word ends in an unstressed, schwa sound. In terms of spelling conventions, "TI" is a common way to represent the "ai" or "ay" sound in words like "tie" or "day", respectively.