This mantra is also written as Dam, though given the presence of m anusvara at the end, it makes more sense to write it as Damm in English. It is best to always refer to how a mantra is written in Sanskrit Devnagri script to ensure proper and correct pronunciation. This is true not just for this but for all mantras, bija (seed) as well as long-form mantras.
Damm mantra represents the essence of Lord Vishnu's energy and is believed to carry the power of his blessings.
- Da: This syllable is associated with the energy of Lord Vishnu. It is believed to invoke the protective and nurturing qualities of the deity, who is often depicted as the cosmic sustainer and preserver.
- mm: This sound, known as the "Anusvara" in Sanskrit, acts as a closing or sealing energy of the mantra. It also allows for the sound vibrational energy to be felt in the Sahasrara i.e. the crown chakra or seventh energy center in the body. It contains and focuses the energy generated by the chanting, making it more potent.
Chanting the "Damm" bija mantra with sincere devotion, concentration, and a clear intention can help invoke the blessings and protection of Lord Vishnu. It can help one to maintain balance, harmony, and stability in one's life, especially during times of change or uncertainty.
As for all mantras, it is very helpful to learn and practice mantra chanting under the guidance of a knowledgeable teacher or spiritual guide. This ensures that you understand the nuances and significance of the undertaken practice. A spiritual guide can also ensure that you conduct your mantra chanting sadhana, i.e. spiritual practice in a way that brings you maximum material blessings and spiritual progress.