A PLL case (i.e. a case where the cubies of the last layer all have the last-side colour facing the last side) where a pair of opposite edge cubies and a pair of corner cubies that lie on either side of one of the wrong edges both need to be swapped.
Etymology: The wrong pieces form a T. "Perm" means permutation.
The numerical value of t perm in Chaldean Numerology is: 5
The numerical value of t perm in Pythagorean Numerology is: 9