Mem

Mem is the 13th letter of the Hebrew alphabet.
It has a value of 40.
The pictograph looks like a wave of water.
The meaning of the letter mem is water, mighty, massive, to come from, flowing from, through or to, chaos.

The number 40 appears numerous times in the old and new testament sometimes connected to the concept cleansing and refining ( by water ).
The mikvah ( a body of water used by the Jewish people as part of ceremonial cleansing ) must contain at least 40 sa'ahs of water. The number 40 and the concept of water again conect the idea of cleansing.

Mem is a symbol of Jesus, the mediator between God and man who had to die to bring us life. Like water ,it is He who cleanses us , tests us and will judge us, like the flood of Noah cleansed and judged.

Mem words;
Malkhut, meaning kingship.
Memshalah, meaning dominion.
Two aspects of God's rule as indicated in Psalm 145v 13, For Your kingdom is a everlasting Kingdom. You rule throughout all generations.

Mayim chayim, meaning living water.
Jesus is the only one who truly satisfies the inner thirst we have for real life and ultimate satisfaction. Emunah (faith ) in Jesus yields refreshment and healing for those whom He has called His own. John 7 38 , Anyone who believes in Me may come and drink ! For the scriptures declare, 'Rivers of living water will flow from his heart.'