The version released in North America (NTSC-U) or Japan (NTSC-J).
The version released in Europe and Australia (usually 50Hz/25fps historically, though 60Hz-compatible on HD consoles). Nier [PAL][NTSC][ISO]
[Release] NieR (Original) - ISO Collection [NTSC & PAL Included] A quick breakdown of what those tags mean: The version released in North America (NTSC-U) or