Monitor

Monitors are a type of artificial intelligence created by Forerunners to look after the Halo Installations. Each Installation was given a Monitor to guard over it. Notable Monitors include 343 Guilty Spark (who watched over Installation 04), 2401 Penitent Tangent (who watched over Installation 05) and 686 Ebullient Prism.

Biography
Monitors are often used to look after one of the seven Halo rings, better known as Installations 01-09, So far only two have been noted to exist.