Red Lettered Weapons?

[Zeroparagon]

While i was playing in Vega today, a duper tried to offer me 2 weapons (suprise suprise) "Tech Twins +250" and "Nucca Sword +250" but the thing that i didnt understand was that when i looked at the items on the ground, the names were in red, which i have never seen before, what does that mean?

[Quo]

You had probably never heard of such items before either, have you? Or seen a grind that high? I means they're S-ranks. S-rank weapons can have custom names. They have very high grind, and their names appear in red. You get them in online challenge mode. Check the guides for more info.