Biometric hologram

The biometric hologram was a holographic technology developed by the Xindi-Aquatics, used to train Xindi surgeons. The Aquatics developed it because of their innate distrust of the written word; they prefered visual stimuli. The hologram was built up from medical data. It was impossible to produce a detailed fabrication with human technology. 

Rajiin provided the Xindi Council with the necessary biometric data to create such a hologram of a Human when she infiltrated Enterprise in September of 2153. The information was eventually used by the Xindi-Reptilian biologist Damron to create a bioweapon. 

In February of 2154, Jonathan Archer presented the Council with a biometric hologram of a Sphere Builder test subject to prove that they and the Guardians were the same race.