יהוה

In Jewish thought the name is an arbitrary designation and conveys the nature and essence of the thing named.

The name of God represents the Hebrew conception of the divine nature and the relation of God to his people. The name of God carries with it the elements: Authority, power and holiness.
One of the names of God that occurs most frequently (6,823 times) in the OT, is the so-called Tetragrammaton, יהוה – this is the most important of God’s Names. It is the four-letter Name represented by the Hebrew letters י.ה.ו.ה (Yod-Hei-Vav-Hei, from right to left). It is often referred to as the Ineffable Name, the Unutterable Name or the Distinctive Name.
Linguistically, it is related to the Hebrew root ה.י.ה (Hei-Yod-Hei, to be) and reflects the fact that God’s existence is eternal.

This name is commonly represented in modern translations by the form “Jehovah” pronounced with the vowels of Adonai (Lord). This name, according to the narrative in Ex. 3:15 were made known to Moses in a vision at Horeb. In another, parallel narrative, Ex. 6:23 it is stated that the name was not known to the Patriarchs.

Jews do not casually write any Name of God. This practice derives from the commandment not to take the Lord’s Name in vain, as many suppose.