Tzadde (or Tzadik) is one of the 12 Simple Letters: Time.
It is the eighteenth letter of the Hebrew Alphabet. Its numerical value is 90.
Tzadde corresponds to the eleventh diagonal path of the Tree of Life, the path which connects Ghevura to Tiferet.
Sepher Yetzirah says about Tzadde: “… He made the letter Tzadde king over eating, and He bound a crown to it, and He combined one with another, and with them He formed Aquarius in the Universe, Shvat in the Year, and the upper stomach in the Soul male and female.”
Tzadde corresponds to the Astrological Sign of Aquarius.
Tzadde is one of the 5 letters of the Hebrew Alphabet to have 2 shapes: צ when is within a word and ץ when is at the end of a word., the latter is called Tzadde Sofit and has a numerical value of 900.
Tzadde, then represents the perfect union of the right and left cerebral hemispheres. It is the graphical representation of a face. It is also a tree, and an antenna.
In Kabbalah, Tzadde is the maximum expression of the objective individuality. The individuality without any personal connotation. Its name is very similar to the word Tzaddiq (צדיק), that means the righteous man, the spiritual leader.
90 is the number of unexpected gifts from God. 90, as the age of Sarah at the birth of Isaac. 90, as the value of the word Manna (מנ).
Tzadde is teaching us the importance of acting in accordance with ethics, and showing recognition of good and bad in our lives. We will get unexpected gifts in return.