There are three codes, each of them consisting of three letters and three numbers. Ignoring the numbers, we're left with:

odn (Agrippa ending)
tyr (Alexander Ending)
lke (Revenge Ending)

The first thing that jumped out at me?

odn = Odin
tyr = Tyr
lke = Loki, sometimes spelled Loke

They're all very prominent figures in Norse mythology.

Odin is the "all father" of Asgard, and is associated with things like wisdom, death and war. This sounds the most like Weyer to me, and in the ending that nets you this code, Daniel "dies" and the assumingly omniscient Weyer and Agrippa seem to be pulling some strings. Also, Odin sacrificed one of his eyes and hung upside down from a holy tree to drink from the Well of Wisdom, which reminds me of Agrippa's own sacrifice to enter the orb's portal with his pupil.

Tyr is the god of war. His origins are shady. Nobody really knows how old he is, and he's rumored to be a lot older than the rest of the gods of Asgard. He sacrificed his hand/arm in a successful attempt to bind/tame the wolf-beast Fenrir. This code is gotten with the ending in which Alexander succeeds, and I think some of the parallels are obvious. Alexander has mysteriously outlived the rest of the nobles by centuries, and has devoted his entire life to relentless pursuit of the power of the orb. If anyone, he's our war-god.

Loki isn't a god at all, but is an immensely powerful shapeshifter with a penchant for mischief. He sows the seeds of discord, but is typically under the favor of Odin (sometimes believed to be his brother). This is shakiest link by far, but the idea of Alexander falling to even his best laid plans by a man far less powerful and supposedly under his control is very Loki indeed. Daniel's subterfuge is far less intense than Loki's ever was, but he did drink the amnesia drought under Alexander's nose to prepare himself to kill him when Alexander least expected it to be coming from a "trusted ally".

So there you have it. Weyer/Agrippa as Odin, Alexander and Tyr, and Daniel as Loki. I only hope that I'm not reading far too much into something that wasn't intended, but I still think it's pretty interesting.

odn314 = 3.14 = pi
tyr299 = 2.99 x 10^8 m/s = c (speed of light)
lke271 = 2.71 = e (exponential growth constant)

They're common scientific/mathematical constants. I haven't seen anything beyond that, and as far as I can tell it's just a way of holding occult mysticism and science in the same regard like the game's characters very much seem to.

I knew off the bat that they were symbols for six of the planets. Starting with the top of the outer ring and spiraling clockwise and inward nets you Neptune, Saturn, Jupiter, Pluto, Earth, Venus. The missing planets are Uranus, Mars and Mercury.

And then Harry came along with this:
"In regards to the three missing planets I'll join you in the 'looking way too far into things' basket and hazard to say they also relate to Odin, Tyr and Loki.

Uranus comes from Ouranos, which was a greek god, literally the Father Sky (So linked to Odin as the "All Father")

Mars is of course the god of War so obvious link to Tyr.

Mercury comes from the Greek god Hermes, who was a patron of tricksters and described as a thief, shapeshifter and more (so linked to Loki).

The conspiracy continues!"