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A diode is a semiconductor device that allows current to flow in one direction only. It has two terminals, an anode (positive) and a cathode (negative). The diode symbol is a graphical representation used in circuit diagrams to indicate the presence of a diode and its orientation within a circuit.
The basic diode symbol consists of a triangle with an arrow pointing towards the direction of conventional current flow. The arrow points from the anode to the cathode.

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