SGNL>05 is an EP released by Isis which acts as an extension to their earlier full-length album Celestial, as the tracks were all directly culled from the Celestial recording sessions. Frontman Aaron Turner describes them as being “part of the same whole”, separated from each other because releasing a double album for the group's first full-length may have been overbearing for listeners. In addition to the standard CD and vinyl LP editions, SGNL>05 is available in a combined, deluxe release with its companion full-length, Celestial.