In Jainism, Upanshu Jaap (also spelled Upamshu or Upanshu Japa) refers to a specific way of reciting prayers, mantras, or sacred texts. It is one of the three primary modes of spiritual recitation in Jain practice:

1. Vaachik Jaap: Recitation done aloud, so that others can hear.
2. Upanshu Jaap: Recitation done in a very low voice, such that only the person reciting can hear, or the lips move but the sound is barely audible.
3. Mansik Jaap: Silent recitation, done entirely in the mind without moving the lips.

Upanshu Jaap is considered more focused and subtle than Vaachik Jaap but less internalized than Mansik Jaap. It helps in increasing concentration while minimizing external distractions and disturbances. This method is often recommended for personal prayer, meditation, or when one is in a public place and wishes to recite mantras discreetly.

In Jain tradition, reciting sacred texts (like Navkar Mantra, Bhaktamar Stotra, or other Sutras) in Upanshu Jaap is believed to bring spiritual merit (Punya), aid in the purification of the soul, and foster mindfulness and devotion.

Summary: Upanshu Jaap in Jainism is a mode of reciting prayers or mantras in a very soft, low voice, typically audible only to oneself, and is considered an effective way to concentrate and gain spiritual benefits.