Sign in the context of "Road sign"

Semiotics is the study of signs. It is an interdisciplinary field that examines what signs are, how they form sign systems, and how individuals use them to communicate meaning. Its main branches are syntactics, which addresses formal relations between signs, semantics, which addresses the relation between signs and their meanings, and pragmatics, which addresses the relation between signs and their users. Semiotics is related to linguistics but has a broader scope that includes nonlinguistic signs, such as maps and clothing.

Signs are entities that stand for something else, like the word cat, which stands for a carnivorous mammal. They can take many forms, such as sounds, images, written marks, and gestures. Iconic signs operate through similarity. For them, the sign vehicle resembles the referent, such as a portrait of a person. Indexical signs are based on a direct physical link, such as smoke as a sign of fire. For symbolic signs, the relation between sign vehicle and referent is conventional or arbitrary, which applies to most linguistic signs. Models of signs analyze the basic components of signs. Ferdinand de Saussure's dyadic model identifies a perceptible image and a concept as the core elements, whereas Charles Sanders Peirce's triadic model distinguishes a sign vehicle, a referent, and an effect in the interpreter's mind.

In the study of the biological sciences, biocommunication is any specific type of communication within (intraspecific) or between (interspecific) species of plants, animals, fungi, protozoa and microorganisms. Communication means sign-mediated interactions following three levels of rules (syntactic, pragmatic and semantic). Signs in most cases are chemical molecules (semiochemicals), but also tactile, or as in animals also visual and auditive. Biocommunication of animals may include vocalizations (as between competing bird species), or pheromone production (as between various species of insects), chemical signals between plants and animals (as in tannin production used by vascular plants to warn away insects), and chemically mediated communication between plants and within plants.

Biocommunication of fungi demonstrates that mycelia communication integrates interspecific sign-mediated interactions between fungal organisms, soil bacteria and plant root cells without which plant nutrition could not be organized. Biocommunication of Ciliates identifies the various levels and motifs of communication in these unicellular eukaryotes. Biocommunication of Archaea represents key levels of sign-mediated interactions in the evolutionarily oldest akaryotes. Biocommunication of phages demonstrates that the most abundant living agents on this planet coordinate and organize by sign-mediated interactions. Biocommunication is the essential tool to coordinate behavior of various cell types of immune systems.

In Christian eschatology, Antichrist, or in broader eschatology, Anti-Messiah, refers to a kind of entity prophesied by the Bible to oppose Jesus Christ and falsely substitute himself as a savior in Christ's place before the Second Coming. The term Antichrist (including one plural form) is found four times in the New Testament, solely in the First and Second Epistle of John. Antichrist is announced as one "who denies the Father and the Son."

The similar term pseudokhristos or "false Christ" is also found in the Gospels. In Matthew (chapter 24) and Mark (chapter 13), Jesus alerts his disciples not to be deceived by the false prophets, who will claim themselves to be the Christ, performing "great signs and wonders". Three other images often associated with Antichrist are the "little horn" in Daniel's final vision, the "man of sin" in Paul the Apostle's Second Epistle to the Thessalonians, and the Beast of the Sea in the Book of Revelation.

Symbolic culture, or non-material culture, is the ability to learn and transmit behavioral traditions from one generation to the next by the invention of things that exist entirely in the symbolic realm. Symbolic culture is usually conceived as the cultural realm constructed and inhabited uniquely by Homo sapiens and is differentiated from ordinary culture, which many other animals possess. Symbolic culture is studied by archaeologists, social anthropologists and sociologists. From 2018, however, some evidence of a Neanderthal origin of symbolic culture emerged. Symbolic culture contrasts with material culture, which involves physical entities of cultural value and includes the usage, consumption, creation, and trade of objects.

Examples of symbolic culture include concepts (such as good and evil), mythical constructs (such as gods and underworlds), and social constructs (such as promises and football games).Symbolic culture is a domain of objective facts whose existence depends, paradoxically, on collective belief. A currency system, for example, exists only for as long as people continue to have faith in it. When confidence in monetary facts collapses, the "facts" themselves suddenly disappear. Much the same applies to citizenship, government, marriage and many other things that people in our own culture consider to be "real". The concept of symbolic culture draws from semiotics, and emphasises the way in which distinctively human culture is mediated through signs and concepts. In sociology, Emile Durkheim, Claude Lévi-Strauss, Clifford Geertz and many others have emphasised the symbolic aspect of distinctively human culture.

A warning sign is a type of sign which indicates a potential hazard, obstacle, or condition requiring special attention. Some are traffic signs that indicate hazards on roads that may not be readily apparent to a driver.

While warning traffic sign designs vary, they usually take the shape of an equilateral triangle with a white background and thick red border. In the People's Republic of China (excluding Macau and Hong Kong) and North Korea, they appear with a black border and a yellow background. In Sweden, Greece, Finland, Iceland, Poland, Cuba, Nigeria, South Korea and Vietnam, they have a red border with an amber background. The polar bear warning sign in Svalbard recently changed from displaying a black bear on white background to a white bear on black background (both signs are triangular with a red border). Some countries (like France, Norway and Spain) that normally use a white background have adopted an orange or amber background for road work or construction signs.

Geresh (׳‎ in Hebrew: גֶּרֶשׁ‎ or גֵּרֶשׁ‎ [ˈɡeʁeʃ], or medieval [ˈɡeːɾeːʃ]) is a sign in Hebrew writing. It has two meanings.

1. An apostrophe-like sign (also known colloquially as a chupchik) placed after a letter:
   • as a diacritic that modifies the pronunciation of some letters (only in modern Hebrew),
   • as a diacritic that signifies Yiddish origin of a word or suffix, (examples below)
   • as a punctuation mark to denote initialisms or abbreviations,
   • or to denote a single-digit Hebrew numeral
2. A note of cantillation in the reading of the Torah and other Biblical books, taking the form of a curved diagonal stroke placed above a letter.