십 [ship] (sino-korean);
열 [yeol] (native korean)
Ten is the number of returning to the beginning.
Everything in the Universe develops in three stages: formation, growth, and completion. If you divide each of these into three stages, the sum of these stages is nine. This is how the number “nine” appears. Every element passes through nine stages of development and then reaches perfection by reaching the unity with the Heavenly Parent, that is, having risen to the tenth stage. That is why the number “ten” is called the number of returning to the beginning.