Logassa nu kausak (Logassa Käusagga) is a Jain practice where a devotee performs a short ritual during a period of stillness (kausagga) while mentally reciting the Logassa Sutra.

What it means in simple terms:

• Logassa Sutra honors all 24 Tirthankaras.
• In a kausagga, you stay motionless and recite one line of Logassa with each breath, typically for a fixed number of breaths (often 25).
• This practice helps purify the mind, reduces harm to living beings, and strengthens reverence for the Tirthankaras and their teachings.

Key points:

• Logassa contains the names and praises of the 24 Tirthankaras.
• The kausagga with Logassa is a common devotional ritual in Jain practice, and it is described as part of the six essential rituals in some Jain traditions. ( jainknowledge.com, jainqq.org)

You can read more here