Q. 1. What is the meaning of the abbreviation JHVH?
A. 1. The abbreviation JHVH stands for "Jahveh" or "Jahweh." JHVH is the abbreviation for "I am." In the early days of the Hebrew language, the vovels were never printed.
JHVH is found in Exodus 3:14 where it states, "God said to Moses, I am who I am. He said further, Thus you shall say to the Israelites, I am has sent me to you."
On this matter, the Catechism of the Catholic Church states: "In revealing his mysterious name, YHWH ("I AM HE WHO IS", "I AM WHO AM" or "I AM WHO I AM"), God says who he is and by what name he is to be called. This divine name is mysterious just as God is mystery. It is at once a name revealed and something like the refusal of a name, and hence it better expresses God as what he is - infinitely above everything that we can understand or say: he is the "hidden God", his name is ineffable, and he is the God who makes himself close to men." [Catechism of the Catholic Church # 206]