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A plain rectangle with a symbol inside naming the function.
Also known as: Rectangular logic symbols, IEC 60617-12 notation, Dependency notation
The international convention draws every logic gate as the same rectangle and writes the function inside it — an ampersand for AND, a one for OR, an equals for exclusive-OR. It carries more information than the distinctive shapes but is harder to read at a glance, which is why both conventions survive.
Draws all logic elements as identical rectangles with a qualifying symbol inside naming the function.
Contexts: Technical drawing, Electrical equipment
Extends to functions the distinctive shapes cannot express, such as majority and threshold elements, which is the argument for it.
Contexts: Technical drawing, Electrical equipment
Coexists with the North American distinctive-shape convention in current documentation, so a reader must be able to read both.
Contexts: Technical drawing, Electrical equipment
A plain rectangle with input lines entering one side, an output leaving the other, and a small mark inside near the top.