“Sacred note with Navkar Mantra” means a holy message or written note that contains the Navkar Mantra.

In Jain Dharma, the Navkar Mantra is the most revered mantra. It is a prayer of respect, surrender, and remembrance to the Arihants, Siddhas, Acharyas, Upadhyayas, and all Sadhus.

So, in simple words:

• Sacred = holy / spiritually pure
• Note = a written message
• With Navkar Mantra = containing the Navkar Mantra

It may refer to:

• a greeting card
• a blessing note
• a prayer slip
• a spiritual message written with the Navkar Mantra

If you want, I can also tell you the meaning of the Navkar Mantra line by line.