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Learn about the different types of prohibitory traffic signs used to restrict certain manoeuvres or traffic in various countries. See examples, images and explanations of no entry, no turn, no overtaking and speed limit signs.
Learn how to use character entity references in XML and HTML documents, and see the list of predefined and custom entities for various scripts and symbols. Find out the differences between numeric and character entity references, and the formal public identifiers for HTML DTD entities subsets.
Learn about the Unicode block that contains styled forms of Latin and Greek letters and decimal digits for mathematics. Find the meaning and usage of the symbols, such as 𝐴 (script capital A) and ℭ (script capital B).
Learn about the various properties assigned to each Unicode character and code point, such as general category, bidi category, combining class, and numeric type. See the list of properties, values, and examples for different code points and characters.
Learn how to write dates and numbers in Wikipedia articles, including fractions, decimals, ratios, units, and percentages. See examples, templates, and tips for consistency and clarity.
Planck's law describes the spectral density of electromagnetic radiation emitted by a black body in thermal equilibrium at a given temperature. It shows that the radiation has a maximum intensity at a wavelength that depends on the temperature, and that the energy of the radiation is quantized in units of hν, where h is the Planck constant.
Gamma matrices are a set of matrices that generate a Clifford algebra and represent the Lorentz group in four dimensions. They are used in the Dirac equation for relativistic spin particles and have various representations and properties depending on the metric signature and dimension.
Learn about the history, design, and usage of the IPA, an alphabetic system of phonetic notation based on the Latin script. The IPA is used by linguists, speech-language pathologists, singers, actors, and others to transcribe the sounds of speech.