On top of the words ut'shuvah utefila utzedakah1 in most machzorim it also says Zom, Kol, Mamon2.
Why zom on teshuvah if the Rambam's formula for teshuva (Hl. Teshuva 2) no mention of fasting; why not vidui azivas hachet etc., instead?
Why kol (voice) by utefila when you can also have tefila belachash (quietly)?
Why mamon by zedakah?
1: And Repentance, and Prayer, and Charity [removes the severity of the decree]
2: Fasting, Voice, Money