Om (English Wikipedia)

Hume translates this as "imperishable Aksara", Max Muller translates it as "indestructible Brahman"; see: Max Muller, The Upanishads, Part 2, Mundaka Upanishad, Oxford University Press, page 36 and Robert Hume, "Thirteen Principal Upanishads" [1], page 367
The Sanskrit word used is Vyadh, which means both "penetrate" and "know"; Robert Hume uses penetrate, but mentions the second meaning; see: Robert Hume, Mundaka Upanishad, Thirteen Principal Upanishads, Oxford University Press, page 372 with footnote 1
Max Muller, Chandogya Upanishad, The Upanishads, Part I, Oxford University Press, page 12 with footnote 1
Max Muller, Chandogya Upanishad, Oxford University Press, pages 1-21
"Aitareya &Taittiriya Upanishads with Shankara Bhashya - English".
Parker, Henry (1909). Ancient Ceylon. p. 428.
Parker, Henry (1909). Ancient Ceylon. p. 490.
Max Muller, Chandogya Upanishad, The Upanishads, Part I, Oxford University Press, pages 1-3 with footnotes
Max Muller, Chandogya Upanishad, The Upanishads, Part I, Oxford University Press, pages 4-6 with footnotes
Robert Hume, Chandogya Upanishad, The Thirteen Principal Upanishads, Oxford University Press, pages 178-180
Max Muller, Chandogya Upanishad, The Upanishads, Part I, Oxford University Press, pages 4-19 with footnotes
Max Muller, Chandogya Upanishad, The Upanishads, Part I, Oxford University Press, page 28 with footnote 1
Max Muller, Chandogya Upanishad, The Upanishads, Part I, Oxford University Press, page 35
Muller, Max (ed.). The Upanishads: Maitrayana-Brahmana Upanishad. Vol. 2. Oxford University Press. pp. 307–308.
Max Muller, The Upanishads, Part 2, Maitrayana-Brahmana Upanishad, Oxford University Press, pages 306-307 verse 6.3
Robert Hume, Mundaka Upanishad, Thirteen Principal Upanishads, Oxford University Press, pages 372-373
Mundaka Upanishad, in Upanishads and Sri Sankara's commentary – Volume 1: The Isa Kena and Mundaka, SS Sastri (Translator), University of Toronto Archives, page 144 with section in 138-152
Hume, Robert Ernest (1921), The Thirteen Principal Upanishads, Oxford University Press, pp. 391–393
Max Muller, Shvetashvatara Upanishad, The Upanishads, Part II, Oxford University Press, page 237
Hume, Robert (1921). "Shvetashvatara Upanishad 1.14 – 1.16". The Thirteen Principal Upanishads. Oxford University Press. pp. 396-397 with footnotes.
Patanjali (1912). The Yogasutras of Patanjali. Translated by Johnston, Charles. New York, C. Johnston. p. 15.
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Misra, Nityanand (25 July 2018). The Om Mala: Meanings of the Mystic Sound. Bloomsbury Publishing. pp. 104–. ISBN 978-93-87471-85-6.
Aitareya Brahmana 5.32, Rig Veda, pages 139-140 (Sanskrit); for English translation: See Arthur Berriedale Keith (1920). The Aitareya and Kauṣītaki Brāhmaṇas of the Rigveda. Harvard University Press. p. 256.
Osho (2012). The Book of Secrets, unpaginated. Osho International Foundation. ISBN 9780880507707.
Misra, Nityanand (2018). The Om Mala, unpaginated. Bloomsbury Publishing. ISBN 9789387471856.
Vālmīki; trans. Mitra, Vihārilāla (1891). The Yoga-vásishtha-mahárámáyana of Válmiki, Volume 1, p.61. Bonnerjee and Company. [ISBN unspecified].
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Eduard Roer, Mundaka Upanishad Bibliotheca Indica, Vol. XV, No. 41 and 50, Asiatic Society of Bengal, page 144
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Von Glasenapp (1999), pp. 410–411. Von Glasenapp, Helmuth (1999). Der Jainismus: Eine Indische Erlosungsreligion [Jainism: An Indian Religion of Salvation] (in German). Shridhar B. Shrotri (trans.). Delhi: Motilal Banarsidass. ISBN 81-208-1376-6.
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Singh, Wazir (1969). Aspects of Guru Nanak's philosophy. Lahore Book Shop. p. 20. Retrieved 17 September 2015.

colostate.edu

cs.colostate.edu

Malaiya, Yashwant K., "Om – significance in Jainism", Languages and Scripts of India, Colorado State University

dentsdelion.com

"Komainu and Niô" (PDF). Dentsdelion Antiques Tokyo Newsletter. 11 (3). 2011.

digambarjainonline.com

"Namokar Mantra". Digambarjainonline.com. Retrieved 4 June 2014.

doi.org

Kudelska, Marta (1 January 2019). Why Is There I Rather Than It?. Peter Lang D. p. 244. doi:10.3726/b17932. ISBN 978-3-631-84429-8.
"Research Items: The Swastika, Gammadion, Fylfot". Nature. 110 (2758): 365. September 1922. doi:10.1038/110365a0. ISSN 0028-0836. S2CID 4114094. The Swastika, p. PA365, at Google Books
Kak, SC (1990). "Indus and Brahmi: Further Connections". Cryptologia. 14 (2): 169–183. doi:10.1080/0161-119091864878.
Gerety, Finnian M. M. (1 February 2021). "Between Sound and Silence in Early Yoga: Meditation on " Om " at Death". History of Religions. 60 (3): 217–218. doi:10.1086/711944. ISSN 0018-2710. S2CID 233429885.
Kumar et al. 2010, pp. 2–5. Kumar, S.; Nagendra, H.R.; Manjunath, N.K.; Naveen, K.V.; Telles, S. (2010). "Meditation on OM: Relevance from ancient texts and contemporary science". International Journal of Yoga. 3 (1): 2–5. doi:10.4103/0973-6131.66771. PMC 2952121. PMID 20948894.

hamsanaga.me

"ឱម: ប្រភពនៃរូបសញ្ញាឱម". Retrieved 17 August 2020.
"ឱម : អំណាចឱមនៅក្នុងសាសនា". Retrieved 17 August 2020.

harvard.edu

dash.harvard.edu

Gerety, Moore; McKean, Finnian (20 May 2015). This Whole World Is OM: Song, Soteriology, and the Emergence of the Sacred Syllable (Thesis). Harvard University, Graduate School of Arts & Sciences. p. 33. ISSN 1746-7527.

holy-bhagavad-gita.org

Mukundananda (2014). "Bhagavad Gita, The Song of God: Commentary by Swami Mukundananda". Jagadguru Kripaluji Yog.

indiancentury.com

"Indian Century - OM". www.indiancentury.com.
""Om" - the Symbol of the Absolute". Retrieved 13 October 2015.

journal.fi

Parpola, Asko (1981). "On the Primary Meaning and Etymology of the Sacred Syllable ōm". Studia Orientalia Electronica. 50: 195–214. ISSN 2323-5209.

merriam-webster.com

"Om". Merriam-Webster (2013), Pronounced: \ˈōm\

mrane.com

Roy, Ankita (2011). Rediscovering the Brahmi Script (PDF). Bombay: Industrial Design Center, IDC, IIT. Archived from the original (PDF) on 3 October 2015. See the section, "Ancient Symbols".

nih.gov

ncbi.nlm.nih.gov

Kumar et al. 2010, pp. 2–5. Kumar, S.; Nagendra, H.R.; Manjunath, N.K.; Naveen, K.V.; Telles, S. (2010). "Meditation on OM: Relevance from ancient texts and contemporary science". International Journal of Yoga. 3 (1): 2–5. doi:10.4103/0973-6131.66771. PMC 2952121. PMID 20948894.

pubmed.ncbi.nlm.nih.gov

Kumar et al. 2010, pp. 2–5. Kumar, S.; Nagendra, H.R.; Manjunath, N.K.; Naveen, K.V.; Telles, S. (2010). "Meditation on OM: Relevance from ancient texts and contemporary science". International Journal of Yoga. 3 (1): 2–5. doi:10.4103/0973-6131.66771. PMC 2952121. PMID 20948894.

patheos.com

"Vajrayana Buddhism Origins, Vajrayana Buddhism History, Vajrayana Buddhism Beliefs". www.patheos.com. Retrieved 4 August 2017.

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"Valmiki Ramayana - Yuddha Kanda - Sarga 117". valmikiramayan.pcriot.com.

peterlang.com

Kudelska, Marta (1 January 2019). Why Is There I Rather Than It?. Peter Lang D. p. 244. doi:10.3726/b17932. ISBN 978-3-631-84429-8.

pinkproton.org

om.pinkproton.org

Messerle, Ulrich. "Graphics of the Sacred Symbol OM". Archived from the original on 31 December 2017. Retrieved 14 January 2019.

sacred-texts.com

Gyatso, Tenzin. "On the meaning of: OM MANI PADME HUM - The jewel is in the lotus or praise to the jewel in the lotus". Internet Sacred Text Archive. Retrieved 17 April 2017.
Crowley, Aleister. Liber Samekh. Internet Sacred Text Archive. Retrieved 27 May 2021.
Crowley, Aleister. Magick in Theory and Practice - Chapter 7. Internet Sacred Text Archive. Retrieved 27 May 2021.

semanticscholar.org

api.semanticscholar.org

"Research Items: The Swastika, Gammadion, Fylfot". Nature. 110 (2758): 365. September 1922. doi:10.1038/110365a0. ISSN 0028-0836. S2CID 4114094. The Swastika, p. PA365, at Google Books
Gerety, Finnian M. M. (1 February 2021). "Between Sound and Silence in Early Yoga: Meditation on " Om " at Death". History of Religions. 60 (3): 217–218. doi:10.1086/711944. ISSN 0018-2710. S2CID 233429885.

shemtaia.com

Maitri Upanishad – Sanskrit Text with English Translation^{[permanent dead link‍]} EB Cowell (Translator), Cambridge University, Bibliotheca Indica, page 258-260

shlokam.org

https://shlokam.org/texts/katha-1-2-15/

slife.org

"Om". 10 November 2020.

spokensanskrit.de

"OM". Sanskrit English Dictionary, University of Köln, Germany
Omkara, Sanskrit-English Dictionary, University of Koeln, Germany

templepurohit.com

"Adi Parashakti - The Divine Mother". TemplePurohit - Your Spiritual Destination Bhakti, Shraddha Aur Ashirwad. 1 August 2018. Retrieved 26 May 2021.

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Kobayashi, Masato (2006). "Pāṇini's Phonological Rules and Vedic: Aṣṭādhyāyī 8.2*" (PDF). Journal of Indological Studies. 18: 16.

uchicago.edu

journals.uchicago.edu

Gerety, Finnian M. M. (1 February 2021). "Between Sound and Silence in Early Yoga: Meditation on " Om " at Death". History of Religions. 60 (3): 217–218. doi:10.1086/711944. ISSN 0018-2710. S2CID 233429885.

universaltheosophy.com

Charles Johnston, The Mukhya Upanishads: Books of Hidden Wisdom, (1920–1931), The Mukhya Upanishads, Kshetra Books, ISBN 978-1495946530 (Reprinted in 2014), Archive of Mundaka Upanishad, pages 310-311 from Theosophical Quarterly journal
Charles Johnston, The Measures of the Eternal – Mandukya Upanishad Theosophical Quarterly, October, 1923, pages 158-162

vedabase.io

"14, King Purūravā Enchanted by Urvaśī". Bhāgavata Purāṇa, Canto 9. Bhaktivedanta Book Trust International, Inc.
Kaviraja, Krishnadasa (1967). "20, the Goal of Vedānta Study". Teachings of Lord Caitanya. Translated by A. C. Bhaktivedanta Swami Prabhupada. Bhaktivedanta Book Trust International, Inc.

web.archive.org

Roy, Ankita (2011). Rediscovering the Brahmi Script (PDF). Bombay: Industrial Design Center, IDC, IIT. Archived from the original (PDF) on 3 October 2015. See the section, "Ancient Symbols".
Messerle, Ulrich. "Graphics of the Sacred Symbol OM". Archived from the original on 31 December 2017. Retrieved 14 January 2019.

wikisource.org

en.wikisource.org

Whitney, William Dwight (1950). Sanskrit Grammar: Including both the Classical Language, and the older Dialects, of Veda and Brahmana. Cambridge, Massachusetts: Harvard University Press. pp. 12, 27–28.
Maitri Upanishad (in Sanskrit) – via Wikisource.

wilbourhall.org

Aitareya Brahmana 5.32, Rig Veda, pages 139-140 (Sanskrit); for English translation: See Arthur Berriedale Keith (1920). The Aitareya and Kauṣītaki Brāhmaṇas of the Rigveda. Harvard University Press. p. 256.

wisdomlib.org

The Vishnu-Dharma Vidya [Chapter CCXXI]. 16 April 2015.

worldcat.org

search.worldcat.org

Beck, Guy L. (2012). Sonic liturgy: ritual and music in Hindu tradition. Columbia: University of South Carolina Press. p. 25. ISBN 978-1-61117-108-2. OCLC 824698506.
Gerety, Moore; McKean, Finnian (20 May 2015). This Whole World Is OM: Song, Soteriology, and the Emergence of the Sacred Syllable (Thesis). Harvard University, Graduate School of Arts & Sciences. p. 33. ISSN 1746-7527.
Parpola, Asko (1981). "On the Primary Meaning and Etymology of the Sacred Syllable ōm". Studia Orientalia Electronica. 50: 195–214. ISSN 2323-5209.
"Research Items: The Swastika, Gammadion, Fylfot". Nature. 110 (2758): 365. September 1922. doi:10.1038/110365a0. ISSN 0028-0836. S2CID 4114094. The Swastika, p. PA365, at Google Books
Gerety, Finnian M. M. (1 February 2021). "Between Sound and Silence in Early Yoga: Meditation on " Om " at Death". History of Religions. 60 (3): 217–218. doi:10.1086/711944. ISSN 0018-2710. S2CID 233429885.

worldcat.org

Beck, Guy L. (2012). Sonic liturgy: ritual and music in Hindu tradition. Columbia: University of South Carolina Press. p. 25. ISBN 978-1-61117-108-2. OCLC 824698506.