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Two thyristors drawn back to back with one gate.
Also known as: Bidirectional triode thyristor, AC switch symbol
A triac conducts in both directions once triggered, which is what makes it the usual device in a mains dimmer. Its symbol is two triangles pointing opposite ways sharing a bar, with a single gate lead.
Denotes a bidirectional thyristor conducting in either direction once triggered, used for alternating-current switching and dimming.
Contexts: Technical drawing, Electrical equipment
Is drawn as two triangles pointing in opposite directions sharing one bar, with a single gate connection.
Contexts: Technical drawing, Electrical equipment
Two solid triangles pointing towards each other across a shared straight bar, with a line leaving one side at an angle.