The four Beej mantras that constitute to become the Aries (Mesh) Rashi Beej mantra are as follows.
Om: ॐ
Om is considered the most mystical sound of the universe. The ancient Indian scriptures, the Vedas, consider it to be the sound of the universe.
The sound Om consists of three fundamental sounds: A, U, M.
Om is considered a holy sound in Hinduism and Buddhism.
In Hinduism, it represents the Trimurti, a merger of Brahma: the creator, Vishnu: the sustainer, and Mahesh (Shiva): the destroyer.
The sound Om is also believed to encompass all of existence: what was, what is, and what will be.
It evokes a sense of completion. Om also symbolizes the three Vedas: Rigveda, Samveda, Yajurveda.
Ayeim/Aim/Aing: ऐं
The Ayeim Beej mantra is an embodiment of Devi Saraswati. Saraswati is known as the goddess of knowledge and wisdom.
Practitioners chant the Ayeim mantra to excel in any field of interest. This is because the mantra powers the knowledge and skill in that field.
This beej mantra is made up of two sounds: Ayei, m. The Ayei sound itself is a combination of Aa and Ee.
The 'm' at the end considered to give the power of dispelling negativity and sorrow.
Kleem: क्लीं
The Kreem Beej mantra invokes Lord Krishna. Krishna is the dissipator of bliss (Ananda) and hence the Kleem sound is linked to Lord Krishna's magnetic quality.
While Kreem represents power, Kleem is more on the gentler side of the same aspect. Kleem is composed of three sounds.
Chanting Kleem helps us to reach our purest goals in our life. It is linked to deep spiritual devotion and will fill your heart with joy and love.
Sauh: सौः
The Sauh Beej mantra is also known as the hridayabeej (seed of the heart) and amrutbeej (seed of the elixir).
The Sauh mantra is composed of three sounds: Sa, Uu, and Ah. According to Vedic texts, the Sauh Beej mantra becomes competent for initiation leading to liberation without any sacrificial rites.
That is why many mantras end with this Beej mantra. It is known for being the final liberation where nirvana and emancipation meet.
The Sauh mantra, also known as Svaha, is also considered the cosmic pulsation of the supreme power. In some context it also invokes your true self translating to "I am".