Usul

Usul may refer to:

From Arabic: أصول (pl. of "root", "principle"):

• Usul al-fiqh, the principles of Islamic jurisprudence
• Usul al-din, the principles of Islamic religion

• Usul al-Sama, a Sunny treatise
• Usul al-Ifta wa Adabuhu, a Fiqh guide

• Usul (music), a rhythmic pattern used in Ottoman classical music.

• Usul, the secret tribal name of Paul Atreides in Frank Herbert's Dune novels
• a species in Neopets