Another tamm was a new challah knife used to cut the challah, while it being sharp which would cause less crumbs from cutting the challah, which is a segula for parnasa as well.
As eating the challah crumbs is a big segulah for parnasa, and here to avoid causing the crumbs from forming as the sharp knife cuts straight through will cause less crumbs.
We should all be gibenched with parnasa birevach without needing to worry!
And the other team which is more famous...
From chabad.org
Purchasing a New Knife for Rosh Hashanah
By Eliezer Danzinger
Question:
I heard that there is a custom to buy a new kitchen knife every year for use on Rosh Hashanah. Did you ever hear of this, and, if so, what is the reason for this tradition?
Answer:
Though this is not a common custom, a little research confirmed the existence of such a tradition, and also provided its reasoning.
G‑d is the One in charge of everything, yet He does have a whole slew of ministering angels who carry out His orders.
"Chatach," (חתך), which means "cut," is the name of the angel in charge of livelihood.
Consider that the final letters of the Hebrew words, פותח את ידך, "You open up Your hand" (Psalms 145:16), spell "chatach." Additionally, the word that follows in the verse, "u'masbe'a" – "and satisfy [the desire of every living being]" has the numerical value of 428 – the same value as the word "chatach."
For this reason, purchasing a new, sharp knife is a segulah (spiritually propitious), for livelihood, which we petition from G‑d for the upcoming year.1
May G‑d inscribe you and your family, and all the Jewish people, for a year abundant in livelihood—and everything good!
Best wishes for a good and sweet year!
Rabbi Eliezer Danzinger for Chabad.org
FOOTNOTES
1.
Nitei Gavriel 11:10.
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