Jah, often associated with Rastafarianism, refers to God or the divine presence. It’s a term used by followers of this spiritual movement, particularly in relation to Haile Selassie I, the former Emperor of Ethiopia, whom they consider to be the incarnation of God. The Rastafarian belief system emphasizes spirituality, unity, and social justice.

Sing unto God, sing praises to his name: extol him that rideth upon the heavens by his name Jah, and rejoice before him.
Psalm 68:4 KJV