Teaching hologram
The teaching holograms consisted of a collection of holoprojector units. These units contained the accumulated wisdom of several original Jedi, including: Cala Brin, Rajivari, Garon Jard, and Ters Sendon. These devices were positioned on the bridges within the Tythonian Gnarls, which is an area located on the planet of Tython. During the period of the Cold War, the Flesh Raiders posed a threat to these holograms, leading to the dispatch of Yuon Par's Jedi Master Padawan to recover them. However, the Twi'lek named Nalen Raloch had already acquired Rajivari's hologram.
Behind the scenes
These holograms are featured in the Star Wars: The Old Republic video game, specifically as part of the Jedi Consular quest entitled "Path of the Jedi." The sequence in which the holograms are discovered may differ, but the sequence of the identities of the projections remains constant: Garon Jard, Cala Brin, Ters Sendon, and ultimately, the absent hologram of Rajivari.