Why is rosh hashana called yom hazikaron?

In the Torah the first day of the seventh month is called "rest day of remembrance by blowing the horn", in Hebrew "Zichron Teru'ah"(Leviticus 23:24). Religious tradition uses different names for each of the holidays. Rosh Hashanah can also be called "Yom Hazikaron" or "Yom Teru'ah."

Answer:

The name "Yom hazikaron," day of remembrance, also alludes to the tradition that on Rosh Hashanah God remembers (takes to mind) His creations and judges them for the coming year (see Talmud, Rosh Hashanah 16a).