Isaac Luria was an influential Rabbi of the fifteenth century, believed to be the greatest Kabbalistic teacher of the era. The name "Ari" means "Lion" and is an example of a Notariqon, or acronym, for "Elohi Rabbi Isaac," the Godly Rabbi Isaac. Luria studied under Moses Cordovero, and while he was an oral teacher who left few writings, he was a great influence in the formation of kabbalistic doctrine; in particular, his concept of emanations.

Diagram of Lurianic cosmology

Pronunciation: Ah-rhee • (noun)

Elsewhere on the Web:

• A short biography of the Ari
• Lurianic Kabbalah