A Holobanner is an object in Chozo Ruins rooms such as the Hall of the Elders in Metroid Prime. There are a few of these in some rooms, and give different scans. Some Holobanners, however, appear in a room but are not scannable.
"Chozo runes translated. Holobanner text reads "The Hall of the Elders"
"The Elder's greatest power lies beyond the second lock."
"Only the holder of twelve shall face the Worm."
"The Great Poison corrupts all, even the Chozo."
"Passageway to Shrine."