Mantra
In Hinduism and Hindu mythology, Mantra means a group of words. There are many such groups of words. Some mantras have meanings. However, there are many mantras which are just syllables, with or without any words. Such mantras do not carry meanings. From the ancient times, Hindus, as well as in many cases, texts of Buddhism and Jainism contain many mantras.
Traditionally, people associate the mantras with various powers. However, it is more a matter of individual faith and experience than a fact of science.
The earliest examples of mantras are many hymns and verses of Vedas. People read them aloud. They thought that by doing so they would get the blessings of the gods and other beings. The system continued in Hindu practices of worship and meditation. Even now, many Hindus believe in the power of mantras to gain health and wealth. Mantras may form part of worship or people may simply recite them loudly or slowly. Some time no recitation may take place, and the person would just think of the mantra silently for long time.
Mantra Media
Mantras written on a rock near Namche Bazaar Nepal
Hare Krishna devotees in Amsterdam carrying a poster with the Hare Krishna Mantra
A personification of the Gayatri Mantra
Votive plaque with Ye Dharma Hetu at the bottom.
Letter A in Siddham script, the seed mantra of Prajñaparamita in Mahayana Buddhism
A stone inscription of the Buddhist "Uṣṇīṣa Vijaya Dhāraṇī" in Siddhaṃ script at Asakusa Temple in Tokyo.
Illustration of the Śūraṅgama Mantra's "Heart Mantra" (hṛdaya).
Japanese Mandala of the Mantra of Light, an important mantra of the Shingon and Kegon sects
A Japanese depiction of the Amida Triad as Seed Syllables (in Siddham Script). Visualizing deities in the form of seed mantras is a common Vajrayana meditation. In Shingon, one of the most common practices is Ajikan (阿字觀), meditating on the mantric syllable A.
Om mani padme hum on the Gangpori (photo 1938–1939 German expedition to Tibet.
Om Tare Tutare Ture Soha.
References
Dictionary of Hindu Lore and Legend (ISBN 0-500-51088-1) by Anna Dallapiccola https://vedic7.blogspot.com/2022/12/mantras.html Archived 2022-12-13 at the Wayback Machine