Triṣṭubh — The Vedic Metre of Divine Sovereignty
Triṣṭubh ('that which stands firm threefold' or 'that which causes praise to stand'; from tri = three + ṣṭubh from stubh = 'to praise, to cause to stand') is the second most prevalent metre of the Ṛgveda — comprising approximately 40% of all Ṛgvedic verses, second only to gāyatrī-derived metres. It consists of four pādas (quarters/lines) of 11 syllables each, for a total of 44 syllables per verse.
The rhythmic character of triṣṭubh is stately, powerful, and majestic — well-suited to hymns addressing mighty, sovereign deities. The presiding deity (chandasya devatā) of triṣṭubh is traditionally identified as Indra in the Ṛgvedic ritual framework, though the metre is freely used across all categories of Vedic deity-address. More than 40% of Ṛgvedic hymns to Indra are in triṣṭubh, as are many hymns to the Ādityas (the twelve solar deities) and to Viṣṇu — whose famous 'three-stride' hymns (Viṣṇu sūktas) in the Ṛgveda (1.154; 1.155; 7.100; 7.99) employ triṣṭubh to celebrate Bhagavān's sovereignty over the three worlds.
The most theologically significant use of triṣṭubh in the entire Vedic corpus is in the Puruṣa Sūkta (Ṛgveda 10.90) — the supreme cosmological hymn describing the cosmic Puruṣa as the origin and substance of all creation. The Puruṣa Sūkta employs a combination of anuṣṭubh and triṣṭubh metres, with triṣṭubh carrying many of the most profound declarations: the Puruṣa as sahasraśīrṣā (thousand-headed), as pervading creation and extending ten fingers' length beyond it, as the source of all the varṇas, all the Vedas, all the chandas (metres), and all the worlds. In Viśiṣṭādvaita, the Puruṣa Sūkta is understood as the Veda's own declaration of Bhagavān Nārāyaṇa's role as śarīrī (the soul) of all creation — and the triṣṭubh verses carrying this declaration are thus among the most sacred Vedic utterances in the entire Śrī Vaiṣṇava canon.
The triṣṭubh metre also appears prominently in the Śrī Sūkta (appended to the Ṛgveda), which celebrates Śrī Mahālakṣmī — Bhagavān's inseparable Pirāṭṭi — as the presiding goddess of śrī (grace, wealth, auspiciousness) who dwells upon the lotus. The Śrī Sūkta is recited in Śrī Vaiṣṇava temple worship (arcana) and household practice as a meditation upon the inseparable unity of Bhagavān and Pirāṭṭi. The use of triṣṭubh in both the Puruṣa Sūkta and the Śrī Sūkta makes this metre the carrier of the twin theological pillars of Śrī Vaiṣṇavism: Bhagavān as the supreme sovereign (aiśvarya) and Śrī as the mediating grace (kāruṇya).