Bījamantra
A bijamantra (Sanskrit: बीजमन्त्र, romanized: bījamantra, lit. 'seed-mantra', in modern schwa-deleted Indo-Aryan languages: beej mantra), or a bijakṣara ("seed-syllable"), is a monosyllabic mantra believed to contain the essence of a given deity. They are found in Tantric Hinduism and in Esoteric Buddhism (Vajrayana / Mantrayana).