Anuṣṭubh (Sanskrit: अनुष्टुभ्, IPA: [ɐnuˈʂʈubʱ]) is a metre and a metrical unit, found in both Vedic and Classical Sanskrit poetry, but with significant differences.
By origin, an anuṣṭubh stanza is a quatrain of four lines. Each line, called a pāda (lit. "foot"), has eight syllables.
The Gāyatrī Mantra (Sanskrit pronunciation: [ɡaː.jɐ.triː.mɐn.trɐ.]), also known as the Sāvitrī Mantra (Sanskrit pronunciation: [saː.vi.triː.mɐn.trɐ.]), is a sacred mantra from the Ṛig Veda (Mandala 3.62.10), dedicated to the Vedic deity Savitr. The mantra is attributed to the brahmarshi Vishvamitra.
The term Gāyatrī may also refer to a type of mantra which follows the same Vedic metre as the original Gāyatrī Mantra (without the first line). There are many such Gāyatrīs for various gods and goddesses. Furthermore, Gāyatrī is the name of the Goddess of the mantra and the meter.