The phrase "सिद्धानं बुद्धानं" (siddhāṇaṁ buddhāṇaṁ) is a part of Jain prayers and refers to the Siddhas (liberated souls) and Buddhas (enlightened beings). In Jainism, the term "Siddha" is commonly used for liberated souls who have destroyed all karmas and attained moksha.

The main Jain sutra that reveres Siddhas is the "Namokar Mantra" (also called the "Navkar Mantra" or "Namaskar Mantra"), which is the most fundamental and revered prayer in Jainism. In the Namokar Mantra, Siddhas are specifically saluted:

णमो सिद्धाणं (Namo Siddhāṇam) Meaning: "I bow to the Siddhas (liberated souls)."

Other Names for this Jain Sutra:

• Namokar Mantra (णमोकार मंत्र)
• Navkar Mantra (नवकार मंत्र)
• Panch Parmesthi Mantra (पंच परमेष्ठी मंत्र)

So, the Jain sutra that includes "Siddhanam" is primarily known as the Namokar Mantra, and it is also referred to by the names above. This mantra is central in Jain worship and honors five supreme beings: Arihant, Siddha, Acharya, Upadhyaya, and Sadhu.