Board Thread:Questions and Answers/@comment-24975288-20140809171550/@comment-4714517-20140815125252

Only difference between N-OP and OP is that the first has some kind of limits on it.

These can range from user being OP on certain specific area (OP on their personal domain/area of interest) while being extremely powerful otherwise, other options would be that the user is OP on their own universe/dimension or lack certain specific Omni-power (no Omniscience or Omnipresence for example, can still have Nigh version).

The other extreme is that the user is OP in every way except for one detail (can't break their word, know single fact/what happens on one room with OS, etc.).

Basically, if the user can do anything except one thing by their power (even if they could do it the other ways, for example not enter certain room by teleporting but could walk in through the door), it's N-OP.