Name #17 of 1000 · Viṣṇu Sahasranāma
अक्षरःakṣaraḥ
Akshara
Indestructible; he who never diminishes
From shloka 2 · chapter Matsya
पूतात्मा परमात्मा च मुक्तानां परमा गतिः ।
अव्ययः पुरुषः साक्षी क्षेत्रज्ञोऽक्षर एव च ॥
pūtātmā paramātmā ca muktānāṃ paramā gatiḥ
avyayaḥ puruṣaḥ sākṣī kṣetrajño'kṣara eva ca
Also in this shloka: pūtātmā · paramātmā · muktānāṃ paramā gatiḥ · avyayaḥ · puruṣaḥ · sākṣī · kṣetrajñaḥ