Imperial Admiral
From Halopedia, the Halo wiki
Template:Covenant Rank Infobox Imperial Admiral is a Covenant Sangheili (Elite) rank. They are beleved to command large fleets.
Summary
Usually an Imperial Admiral operates on a high ranking Covenant Flagship such as an Assault Carrier, Supercarrier, or other powerful capital ships within the Covenant armada. They seem to be higher ranked than a Zealot[1], but this is not known for sure. It is revealed in Halo: Ghosts of Onyx that the Imperial Admiral controls the fleet of the covenant. No Sangheili of this rank appear in any of the Halo games. It is also unknown if when Xytan 'Jar Wattinree defected from the Covenant if the Prophets replaced him with a Brute, or if the position is still empty. As of yet, very little is known about the rank. Xytan travels with a large hologram of himself, and it is unknown if other Imperial Admirals do so.
The armour could possibly be silver armor covered with the gold Forerunner glyphs of sacred mystery, Such silver-and-gold Elite armor has yet to be seen or mentioned elsewhere, and may be superior in quality to the gold armor of a Zealot [2].