Understand the difference.

Compare the meaning, drawing context and source references of two entries. A similar graphic or shared abbreviation does not establish equivalence.

OR3

IEEE / ANSI

ANSI three-input OR gate

The three-input OR uses the shield-shaped outline with a concave back and a pointed front, with a third input added on the curved back edge. Any input at logic 1 produces a logic 1 output. Triple three-input OR packages exist for this function.

Drawing use

Schematic

Application

Logic & signals

Reference family

IEEE / ANSI / Manufacturer

Form evidence

Curved-back OR outline with three inputs. Distinctive-shape form as used in IEEE/ANSI-style schematics and manufacturer data books. Independent educational drawing; exact standard geometry and compliance are not asserted. The counterpart is the matching functional concept; no equivalence of every detailed standard graphic is asserted.

A distinction that matters

An exclusive-OR has an extra curved line behind the back; a plain OR has a single back curve.

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OR

Symbols

OR gate

A positive-logic element whose output is true when at least one input is true.

Drawing use

Schematic

Application

Logic & signals

Reference family

Manufacturer

A distinction that matters

Inclusive OR differs from XOR: OR remains true when both inputs are true.

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Original educational previews. Follow the source references on each full entry for the appropriate standard or selected product.