Tsadi — the 18th Hebrew letter
צ ץ
Spelled צדי — full spelling gematria 104
Symbolism
Righteousness (tzedek), the righteous one (tzaddik); the hunter's hook turned to holy pursuit; ninety — Sarah's age at Isaac's promise
What the letter is built from
Traditionally a bent nun carrying a yod on its shoulder — the faithful one bearing the divine spark
Its first root in Scripture
The first tsadi root is tselem — 'Let Us make man in Our image'
Messianic thread
The Tzaddik is a title of Messiah — 'the Righteous One' (Acts 7:52). The bent tsadi bearing a yod is the humble servant carrying the Name; its first root, 'image,' points to the One who is the image of the invisible God.
In the mystical tradition
The tzaddik is the foundation of the world (Prov 10:25); the two forms teach the righteous bent in exile and upright in redemption.
Wisdom of the letter
Tzedakah — righteousness as generosity: in Hebrew, charity is not kindness but justice.
