Understand the difference.

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

≥1

IEC

IEC NOR gate (rectangular form)

The IEC NOR element is drawn as the ≥1 OR box with a negation circle at the output. Its output is at the external 1 state only when every input is inactive, which makes it a natural way to show an all-healthy or all-clear permissive on a logic sheet.

Drawing use

Schematic

Application

Logic & signals

Reference family

IEC / Manufacturer

Form evidence

≥1 rectangular element with output negation circle. Qualifying-symbol and dependency conventions as explained in TI's public overview of IEEE Std 91-1984, which incorporates IEC 617-12 work. Independent educational drawing; not certified IEC geometry or an IEC database identifier. The counterpart is the matching functional concept; no equivalence of every detailed standard graphic is asserted.

A distinction that matters

A ≥1 element without the output circle is a plain OR; the circle is the only difference.

Full referenceAdd to legend

NOR

Symbols

NOR gate

A logic gate that inverts an inclusive-OR result.

Drawing use

Schematic

Application

Logic & signals

Reference family

Manufacturer

A distinction that matters

NOR is different from NAND because the underlying input combination is OR rather than AND.

Full referenceAdd to legend

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