What is the drop rate of Saber?

Can you please elaborate on the concept of "drop rate" in the context of Saber, and explain what it specifically refers to? Is it related to the frequency at which Saber tokens or rewards are distributed to users? Or does it have to do with the likelihood of acquiring Saber-related items or assets through certain in-game or platform mechanisms? Additionally, how is the drop rate of Saber determined, and are there any factors that can influence its value?