Answer

The Siddhi Tap you are referring to is generally known as Chauvihar Siddhi Tap or a form of Vardhaman-Ayambil / Siddhi Tap arranged in an ascending and descending pattern.

It is performed for 88 days:

• First 44 days: increasing order
• Next 44 days: decreasing order

This type of tap is connected with disciplined fasting or Ayambil-based austerity, where the number or intensity increases first and then gradually reduces.

Explanation

In Jain tapasya, such a pattern is often called:

• Chadti-utarati tapasya — increasing and decreasing austerity
• Vardhaman pattern — gradually increasing
• Hrasman pattern — gradually decreasing

Because local Jain sanghs and traditions may use slightly different names and rules for Siddhi Tap, the exact name and method can vary.

Takeaway

The 88-day Siddhi Tap is an ascending-descending Siddhi Tap, commonly understood as a Chadti-Utarati Siddhi Tap. For the exact vidhi, it is best to follow the guidance of your Guru Bhagwant or local Jain sangh, because the rules may differ by tradition.