Yōga Sūtras
Yōga Sūtra 1.27
तस्य वाचकः प्रणवः।
HE is conveyed by the pranavah (syllable 'Ōm').
In classical literature out of respect syllable 'Ōm' is never written directly. It is indicated by a name 'Pranava'. The reason is, as explained, it conveys all knowing īśvaraḥ, who is not affected by obstacles, fruits of activities, desires, and who is not bound by time.

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ॐ असतो मा सद्गमय। तमसो मा ज्योतिर्गमय। मृत्योर्माऽमृतं गमय। ॐ शान्ति: शान्ति: शान्ति: ॥ - बृहदारण्यकोपनिषद् 1.3.28
"Ōm! Lead me from the unreal to the real, from darkness to light, and from death to immortality. Let there be peace, peace, and peace. Ōm!" - Brihadaranyaka Upanishad 1.3.28

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