Aitch

The word hour is written with a silent aitch.

Cockneys drop their aitches.

The word length, which contains only four sounds l e ng th, is usually spell'd thus, el ee en gee tee aitch.

"If you've got any drawing-room manners, or a dislike to eating peas with a knife or dropping aitches, you'd better chuck 'em away. They ain't no further use."

She frowned, hearing Lim Cheng Po's voice, so English, so refined, so very English upper-class. And often she had had to tell Joe about his aitches.