1. A computer-implemented method for object identification comprising: receiving a signal produced by a physical interaction with an object to be identified, the signal produced during physical interaction with the object by an identification structure coupled to the object, wherein the identification structure comprises a plurality of bumps or teeth and the signal comprises a sound produced by pin or tooth rubbing against the bumps or teeth; processing the signal to form digital data identifying the object interacted with; and accessing a database using the digital data to retrieve additional information identifying or describing properties of the object.