Q:

Why by "Ut'shuva, Utefila UItzedaka" does it say "Zom, Kol, Mamon"?

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

A:

The Sefer HaMinhagim of R' Yitzchak Tyrnau notes that all three words have the same gematria of 136; this is to remind us that all three aspects are equally important (Hagahos haMinhagim Aseres Y'mei Teshuvah). The Chasam Sofer notes that these three elements were employed by the people of Ninveh in their efforts to achieve divine pardon, and this set the precedent for future generations (Commentary to perek Arvei Pesachim).

