In Digambar Jain tradition, a polite and common greeting is:

• Jai Jinendra (hands folded in namaste)

Other respectful options:

• Namo Arihantanam (glory to the Arihants) – more formal and devotional
• Namaskar (a simple respectful greeting)

Notes:

• Jai Jinendra is widely used by both Digambar and Shwetambar communities, so it’s a safe, respectful choice when meeting Digambar Jains.
• If you know they prefer a more devotional greeting, you can use Namo Arihantanam, but Jai Jinendra is usually perfectly appropriate in everyday encounters.