sa.raph denotes the plural beings standing above him and flying in Isaiah's vision.

The attested plural noun identifies beings in Isaiah's vision: they stand above him with six wings in Isaiah 6:2, and one flies to the speaker carrying a glowing stone in Isaiah 6:6.

1. Visionary beings above and in flight · dominant

   Both occurrences are common masculine plural absolute nouns. In Isaiah 6:2 the APB renders beings standing above him, each with six wings; in Isaiah 6:6 it renders one of them flying to the speaker with a glowing stone in his hand.

   Isaiah 6:2Isaiah 6:6

In the Anselm Project Bible: The APB presents the plural as “Seraphim” in both verses, describing their standing above him in Isaiah 6:2 and one flying to the speaker in Isaiah 6:6. The verse is read as a whole.