Answer

In Jain usage, “Attham” usually means a three-day continuous fast. “Aatham” also refers to the 8th lunar day (Ashtami), which many Jains treat as an auspicious day for upvaas, ayambil, pratikraman, and svādhyāy. I could not verify a standard Jain observance formally called “108 attham” as one fixed term. ( jainknowledge.com)

Explanation

If “108” is what you meant in a Jain context, it often refers to 108 recitations of the Navkar Mantra, 108 beads in a mala, or, in some pujas, 108 offerings. That is separate from Attham itself. ( jainworld.jainworld.com)

Spiritual Understanding

The purpose of Attham is self-restraint, inner purification, and karmic reduction through discipline and devotion. In Jain Dharma, the outer fast supports inner purification. ( jainknowledge.com)

Takeaway

So, in simple words: Attham = 3-day fast, Aatham = 8th lunar day, and 108 usually refers to a count used in chanting or worship, not to a separate standard fast. ( jainknowledge.com)