This is a beautiful Jain mantra of worship to the Arihants / Jinas.

You wrote:

“Om Hreem Shreem Sijjamsam Jinam Namah”

Let’s break it in a simple way:

1. Om

– Sacred sound used at the start of many mantras. – Invokes auspiciousness and purity of mind.

1. Hreem

– A sacred bīja (seed) syllable. – In Jain usage, it is connected with inner purity, spiritual energy, and turning the mind towards the soul (ātma).

1. Shreem

– Another bīja syllable. – Connected with mangal (auspiciousness), śubh bhāva (pure, wholesome feelings), and spiritual wealth (dharma, self‑restraint, right faith).

1. Sijjamsam (from “Siddhaṃ samanam” / “Siddhaṃ samaṃ”)

– Pointing towards the Siddhas (liberated souls) and the Samyak / Sama state (perfect, equal, passionless state). – It remembers those who have completely destroyed all karmas and are in a state of perfect purity.

1. Jinam

– Means Jina = conqueror of inner enemies (kashāyas: anger, pride, deceit, greed). – Refers especially to Arihant Bhagwān and Tirthankars.

1. Namah

– “I bow”, “I offer reverent salutation”.

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Simple overall meaning (arth)

“Om, I invoke auspicious, pure spiritual energy. With the power of purity (Hreem) and auspiciousness (Shreem), I bow to the Jinas – the conquerors of inner passions – and to the perfected, liberated souls abiding in equality (Siddhas).”

Or even simpler:

> “With pure and auspicious feelings, I bow to the Jinas and the Siddhas.”

This mantra helps to:

• Remember the Arihants and Siddhas
• Develop shuddha bhāva (pure feelings)
• Reduce inner negativity and increase devotion (bhakti) and calmness.

If you’d like, I can also give you a short way to chant it daily (how many times, with what bhāva).