How is a semiconductor diode's cathode lead usually identified?

A semiconductor diode's cathode lead is most commonly identified by a stripe or band on the body of the diode. This distinguishing mark is typically located near one end of the diode and serves as a visual guide to indicate which lead is the cathode. The cathode is the electrode through which conventional current leaves the diode when it is forward biased.

While other labeling methods, such as the use of the word "cathode" or markings like the letter "C," can theoretically be used, they are not standard practice. The stripe is the most recognizable and widely accepted method for identification in various types of diodes, making it the correct and preferred choice for practical applications.