To my understanding originally Horus had the "Eye of Terra", the ever watchful eye of the Imperial homeworld.

The red eye you are seeing is the Eye of Horus. Its still used, in different designs, by the Black Legion in the 41k. Its one of Horus' ways of showing that he was the True Master of Mankind.

 

To my understanding originally Horus had the "Eye of Terra", the ever watchful eye of the Imperial homeworld.

The red eye you are seeing is the Eye of Horus. Its still used, in different designs, by the Black Legion in the 41k. Its one of Horus' ways of showing that he was the True Master of Mankind.

Why does Sang have them on his armor as well?

 

From what I understand, the Eye was on multiple primarches armour, such as Horus and Sanguinious. the symbol was know as the Eye of Terra and represented that the Primarches and there legions were the Emperors eyes while he was away. The Eye of Terra was not know as the Eye of Horus until Horus turned to Chaos, and used the Eye of Terra as his personal marking, Therefore making the Eye of Terra an evil symbol of Chaos and from then on known as the Eye of Horus.

Hope that wasnt too confusing. lol

 

If you look carefully, the symbols on Sanguinius's armour are not actually eyes. But instead they are blood drops, one of his own personal symbols.

Unlike the eye symbols on Horus, the symbols on Sanguinius taper to a point upwards but not downwards. They remain fat and round, like a tear drop of blood.

 

Ugh....how many times has this been asked?

 

Probably several times but i was not here for them and google kept giving me Egyptian answers about the eye of Horus. Sorry to get you so exacerbated.

Everyone else who had something helpful, I appreciate it.

 

Bah Darkreever beat me to it

 

Wait, Horus has the 'Eye of Terra' on his armor, right. And the sons of horus, has the 'eye of horus' on their armor. But when abbadon denounced horus and re-named the legion, the black legion, they still kept their eye iconography, although with the inclusion of an eight-pointed chaos star

- so what 'eye' do the black legion represent on their armor?

 

so what 'eye' do the black legion represent on their armor?

Maybe the "Eye of Chaos"

 

I agree with reever, I all ways thought that they were just blood drops on Sang.