Tibetan Mala

Since a common part of Tibetan Buddhist practice is repeating (mentally or out loud) certain mantras thousands or even hundreds of thousands of times, it is useful to use your mala for counting off the number of prayers, as a spiritual abacus. Even if you are not actively counting, the repeated recitation of the mantra while proceeding bead by bead through the mala serves to focus and calm the mind.

https://tibetuniversaltravel.com/tibet/religion-in-tibet/buddhist-prayer-beads-or-mala/