In Jainism, the "Navkar Akshar Tap" refers to a spiritual practice (tap means austerity or penance) centered around the sacred Navkar Mantra (Namokar Mantra or Navkar Mantra). This mantra is the most fundamental and revered prayer in Jainism, honoring the Panch Parmesthi (the five supreme beings): Arihant, Siddha, Acharya, Upadhyaya, and Sadhu.

Navkar Akshar Tap specifically is a form of tapa (austerity or penance) in which the devotee undertakes a spiritual practice using the letters (akshar) of the Navkar Mantra. There are several ways this tap is performed, but the most common is:

• The Navkar Mantra contains 68 letters (akshar).
• The devotee observes a fast or a special vow for 68 days, each day dedicated to one letter of the mantra.
• On each day, the devotee focuses on meditation, recitation, and spiritual reflection on the meaning and significance of that particular letter of the mantra.
• Some observe this tap by reciting the mantra 68 times or performing prostrations (vandana) corresponding to the number of letters.
• The practice is considered highly meritorious and is believed to help in the destruction of karmas and the attainment of spiritual purity.

This special form of tapasya is undertaken with great devotion, especially by those seeking spiritual upliftment, atonement, or fulfillment of particular vows.

Significance:

• Increases spiritual strength and concentration.
• Purifies the mind and body.
• Accumulates punya (spiritual merit).
• Deepens understanding and reverence for the Navkar Mantra.

Note: The details of how Navkar Akshar Tap is performed may vary according to different Jain sects (Shwetambar, Digambar, Sthanakvasi) and traditions.

If you need a step-by-step guide or more details about how to perform Navkar Akshar Tap, please let me know!