IPA: /eɪtʃ/
KK: /eɪtʃ/
This term refers to the name of the letter 'h' in the English alphabet.
The word 'hat' starts with the letter aitch.
The word 'aitch' originates from the letter name 'H' in the English alphabet, which is derived from the Latin 'hā', itself from the Greek 'eta' (Η, η). The term 'aitch' is used to denote the pronunciation of the letter 'H'.
Think of the letter 'H' and how 'aitch' is simply the way we say its name.