A sign can denote any of the following:
- Sun signs in astrology
- Sign or signing, in communication: communicating via hand gestures, such as in sign language.
- Gang signal
- Sign, in Tracking (hunting): also known as Spoor (animal); trace evidence left on the ground after passage.
- A signboard.
- A sign, in common use, is an indication that a previously observed event is about to occur again
- Sign, in divination and religion: an omen, an event or occurrence believed to foretell the future
- Sign, in ontology and spirituality: a coincidence or surprising event thought to reveal divine will; see synchronicity
- Sign (linguistics): a combination of a concept and a sound-image described by Ferdinand de Saussure
- In mathematics, the sign of a number tells whether it is positive or negative. Also, the sign of a permutation tells whether it is the product of an even or odd number of transpositions.
- Signedness, in computing, is the property that a representation of a number has one bit, the sign bit, which denotes whether the number is non-negative or negative. A number is called signed if it contains a sign bit, otherwise unsigned. See also signed number representation
- Sign, in biology: an indication of some living thing's presence
- Medical sign, in medicine: objective evidence of the presence of a disease or disorder, as opposed to a symptom, which is subjective
- Sign (semiotics): the basic unit of meaning
- Information sign: a notice that instructs, advises, informs or warns people
- Traffic sign: a sign that instructs drivers; see also stop sign, speed limit sign, cross walk sign
- Sign, in a writing system: a basic unit. Similar terms which are more specific are character, letter or grapheme
- Commercial signage, including flashing signs, such as on a retail store, factory, or theatre
- Signature, in history: a handwritten depiction observed on a document to show authorship and will
- For marketing or advocacy purposes, a signage refers to the collective use of signs to convey a message.
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