तस्य वाचकः प्रणवः ॥२७॥
tasya vācakaḥ praṇavaḥ ||27||

[RS] 1.27 OM is a symbol for ishvara.

[JW] 1.27 The word-expressing Him is the Mystic syllable [pranava].

[SS] 1.27 The word expressive of Isvara is the mystic sound OM. [Note: OM is God's name as well as form.] [p42]

[TD] 1.27 In the way most appropriate to the qualities of God. [p157]

[EB] 1.27 The name designating him is the mystical syllable om. [p105]

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(तस्य, tasya) = whose; being (i.e. ishvaras)
(वाचकः, vācakaḥ) = verbal symbol; word
(प्रणवः, praṇavaḥ) = a symbol that always retains its purity; the OM symbol; the OM mantra