Names #428, #959 · Viṣṇu Sahasranāma
प्रमाणम्pramāṇam
Pramanam — appears 2 times in the stotram, each with its own meaning
Name #428
The measure and proof of all truth
From shloka 46 · chapter Vāmana
विस्तारः स्थावरस्थाणुः प्रमाणं बीजमव्ययम् ।
अर्थोऽनर्थो महाकोशो महाभोगो महाधनः ॥
vistāraḥ sthāvarasthāṇuḥ pramāṇaṃ bījamavyayam
artho'nartho mahākośo mahābhogo mahādhanaḥ
Also in this shloka: vistāraḥ · sthāvarasthāṇuḥ · bījamavyayam · arthaḥ · anarthaḥ · mahākośaḥ · mahābhogaḥ · mahādhanaḥ
Name #959
The standard of all truth
From shloka 103 · chapter Kalki
प्रमाणं प्राणनिलयः प्राणभृत्प्राणजीवनः ।
तत्त्वं तत्त्वविदेकात्मा जन्ममृत्युजरातिगः ॥
pramāṇaṃ prāṇanilayaḥ prāṇabhṛtprāṇajīvanaḥ
tattvaṃ tattvavidekātmā janmamṛtyujarātigaḥ
Also in this shloka: prāṇanilayaḥ · prāṇabhṛt · prāṇajīvanaḥ · tattvam · tattvavit · ekātmā · janmamṛtyujarātigaḥ