True. In Jainism, taking refuge in the Five Holy Beings (Arihant, Siddha, Acharya, Upadhyaya, and Sadhu) is expressed through the Namokar Mantra (Navkar Mantra). The mantra begins with the word "Namo," but in recitation and meditation, some practitioners may use "Om" (or "Aum") as a condensed representation of the mantra. In certain Jain traditions, "Om" is considered to symbolize the five supreme beings, and chanting "Om" is seen as a way to take refuge in them.