In Jainism, "Mangal Devo" refers to auspicious or beneficent deities who are invoked for blessings, protection, and the removal of obstacles. However, Jainism primarily focuses on the worship of Tirthankaras (spiritual victors) rather than gods in the conventional sense. The concept of deities in Jainism is different from that in many other religions, as Jains do not believe in a creator god. Instead, they recognize various celestial beings (devas) who reside in the heavens, but these beings are also bound by karma and the cycle of birth and rebirth.

In rituals and prayers, Jains often recite the "Manglik" or "Navkar Mantra," which is considered the most auspicious (mangal) mantra. This mantra offers obeisance to the Panch Parameshti (the five supreme spiritual beings):

1. Arihant — the perfected beings who have conquered inner passions.
2. Siddha — liberated souls.
3. Acharya — heads of the Jain congregation.
4. Upadhyaya — masters of Jain scriptures.
5. Sadhu — monks and nuns.

These are the truly auspicious beings in Jainism. Therefore, when Jains refer to "mangal," it is often in the context of these revered souls rather than traditional gods.

If you meant a specific ritual or context by "Mangal Devo," please provide more details for a more precise answer.