In Figure E6-2, which is the schematic symbol for a Schottky diode?

In standard electronic schematics, a Schottky diode is represented by the basic diode symbol—a triangle pointing to a line—but with the cathode line modified to look like a squared-off letter 'S'. This 'S' shape serves as a visual mnemonic for 'Schottky'. By contrast, the standard rectifier diode uses a straight line for the cathode, while a Zener diode uses a line with two bent flags resembling a 'Z'. A tunnel diode typically has a cathode line resembling a square bracket with inward-pointing flags. When looking at exam diagrams, identifying these subtle flags on the cathode bar is the key to differentiating the various specialized diodes. Always look for the distinct 'S' hooks to confirm a Schottky diode.