A seal configured to provide a predefined clearance between the seal and an outer surface of a rotor mounted rotatably about an axis A disposed opposite the seal, the seal being characterized in that the inner surface of each inner ring segment includes a plurality of patterns hollowed out from the inner surface of the inner ring segment, the plurality of patterns including at least: a first pattern having a longilineal shape extending along a diagonal direction with respect to the axial direction; and a second pattern including a first part extending along the same diagonal direction as the first pattern, and a second part extending along the circumferential direction.