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The Icon of Sin can be seen in the Necropolis, and is mentioned briefly in data logs.
A tablet in the map Argent D'Nur suggests that the Icon of Sin is the reborn and demonized so (or was at least demonized by the Icon of Sin) of the Night Sentinel that betrayed his brethren, unleashed onto his father's realm during the battle that assured hell's victory of Argent D'Nur. As of now, the demon is currently dormant, according to a UAC data log that makes reference to it.
This is an easter egg that can be found in Doom (2016). The player needs to shoot the icon in the forehead with preferably a rocket launcher,similarly to Doom 2. The icon will say something demonic before shooting a cube which holds a Doom marine figurine.