What is the year prefix of PSU?

[Sinue_v2]

Phantasy Star had SC & AW, PSO had AUW, but what is PSU's - and does anyone know what it might stand for?

Are there there two different prefixes, as in.. one predating the great war, and one after the peace tready?

[A2K]

Curiously enough, I didn't spot any specific year numbers myself at all. I'll dig a bit, though, I suspect I might have missed it in some obvious places.

[_Tek_]

Most assume it takes place in the past. But its almost its own new era.