The current document is directed to methods and devices that facilitate object orientation. In particular, the current document is directed to methods and devices that facilitate tactile orientation of objects, such as connectors, keys, cards, and other objects that are manipulated by human users for insertion into complementary connectors, slots, and other receptacles. In addition to facilitating tactile orientation of objects, the devices and additionally provide mechanical advantage for objects insertion and removal and may additionally provide visual orientation indications, and other indications, to human users. The currently disclosed devices are tangible, physical objects or features that, when held, felt, and/or manipulated by human users, provide a tactile indication of the orientation of an engagement feature of an object is inserted into a complementary connector, slot, port, or other receptacle.

A locking system comprises a lock cylinder which has a cylinder housing, a cylinder core rotatably supported in the cylinder housing and having a keyway, and has a plurality of tumblers which partly project into the keyway, and which furthermore comprises a key which has a key bow and a key shaft which has a shaft profile for acting on the tumblers. An abutment section is formed at the key shaft between the key bow and the shaft profile, said abutment section having an abutment profile having at least one projection and an undercut formed between the projection and the shaft profile. The lock cylinder furthermore comprises a movable counter-abutment. In this respect, the abutment section of the key and the movable counter-abutment of the lock cylinder are arranged and configured such that, on an introduction of the key into the keyway, the abutment section abuts the movable counter-abutment with at least one abutment surface within the keyway and in so doing forms the only active abutment formed at the key for limiting the introduction of the key into the keyway to a correct axial introduction depth.

A locking device includes a lock, a blade and an attachment. The lock includes a key slot and a lockpin unit. The key slot extends from a key insertion face to an interior of the lock. The lock includes an inner wall. The lockpin unit is in the lock and extends into the key slot from the inner wall of the lock. The blade includes a guiding end, a control end, a receiving portion located between the guiding and control ends, and a guiding piece. The guiding piece is arranged at the guiding end. The guiding end is located in the key slot, and the control end is located outside the key slot. The attachment is detachably attached to the receiving portion. The blade is slid to drive the attachment to be in or off contact with the lockpin unit.