Answer

If you mean the Jain tap where fasting is done for 2 days (bela) and 3 days (tela), it is generally called Bela-Tela Tap.

Explanation

• Bela usually means two consecutive upvas
• Tela usually means three consecutive upvas
• In Jain practice, these are forms of tapasya or vrat

Spiritual Understanding

Such tapasya is done for:

• self-discipline
• purification of karma
• detachment from food and comfort
• strengthening inner faith and willpower

Takeaway

So, the name is commonly Bela-Tela Tap. In Jain Dharma, it is a respected form of austerity and spiritual practice.