haloing

This term is defined in ECSS-Q-ST-70-08C as
condition existing in the base laminate of a printed circuit board in the form of a light area around holes or other machined areas on or below the surface of the laminate

This term is defined in ECSS-Q-ST-70-10C as
mechanically-induced fracturing or delamination, on or below the surface of a base material, that is usually exhibited by a light area around holes or other machined features [IEC 60194 (1999-04)]