Ћ

Australian creates a special character - Ћ - to replace English language's most common word "The"

Stick Ћ where the sun don't shine! I imagine it will be as successful and popular as sfbe.

OH I just reread the OP -- I use my character for the sound unvoiced th, not for the word "the".  That's rather goofy.  We don't need a symbol for every word.  That's called Chinese.