They have a dynamic personality and have fire as their element. Like the rest, Aries consists of fewer births during the end of March; thus, this becomes a rare sign.
It is the 9th astrological sign. Moreover, their element is fire, and their symbol is The Archer or Centaur. Sagittarius covers most of December, and fewer people are born during that time. Thus, they become the rare zodiac sign.
The sun is in Aquarius at the end of January and then, after some time, moves to January. Technically, January is the month with the least number of births, and February is the shortest month of the year. Therefore, this makes Aquarius one of the rarest signs.