Covenant languages
From Halopedia, the Halo wiki
The Covenant has their own unique language, which is heard in Halo: Combat Evolved. In Halo 2, their words are translated for the convenience of the player. Elites in Halo 1 spoke a deep, warbling tongue. This was achieved by playing in reverse the voice acting of David Scully. The ever popular "Wort wort wort!" shouted by many Elites during gameplay is actually "Go go go!" reversed.
Written Language
Conversations from the Universe contains letters written by the Prophets of Truth and Supposition. The writing in these letters resembles English, with various alterations.
Before the release of Halo 2, the official website was made to look like a Covenant computer complete with a Covenant language. This language was a simple cipher with characters made from triangular shapes.
Text, or writing, in the Covenant appears to be mostly triangle shapes and composed almost completely of equilateral triangles, except for a single shape so far. It has been noted that this form of text was used by both Brutes and Jackals in Halo: Uprising Issue #1 so far. Whether all of the species that are or were in the Covenant use this form of text is currently unknown.
References
Halo: Uprising Issue #1, pages 20, 32, 33 and 34
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