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In logic, a set of symbols is commonly used to express logical representation. The following table lists many common symbols, together with their name, how they should be read out loud, and the related field of mathematics.
In this table, parentheses mark letters that stand in for themselves or for another. For instance, a rotated 'b' would be a 'q', and indeed some physical typefaces didn't bother with distinct sorts for lowercase b vs. q, d vs. p, or n vs. u; while a rotated 's' or 'z' would be itself.
Script capital H 210B ℌ: Black-letter capital H 210C ℍ: Double-struck capital H 210D ℎ: Planck constant: 210E ℏ: Reduced Planck constant (Planck constant over 2π) 210F ℐ: Script capital I 2110 ℑ: Black-letter capital I 2111 ℒ: Script capital L 2112 ℓ: Script small L (LaTeX: \ell) 2113 ℔ L B bar symbol 2114 ℕ: Double-struck ...
Upside-down marks, simple in the era of hand typesetting, were originally recommended by the Real Academia Española (Royal Spanish Academy), in the second edition of the Ortografía de la lengua castellana (Orthography of the Castilian language) in 1754 [3] recommending it as the symbol indicating the beginning of a question in written Spanish—e.g. "¿Cuántos años tienes?"
Strategies can be used to render words upside down in languages such as HTML that do not permit rotation of text; using Unicode characters (especially those in the IPA), a very close approximation of upside-down text (also called flip text) can be achieved.
This is an accepted version of this page This is the latest accepted revision, reviewed on 15 January 2025. See also: List of Cyrillic multigraphs Main articles: Cyrillic script, Cyrillic alphabets, and Early Cyrillic alphabet This article contains special characters. Without proper rendering support, you may see question marks, boxes, or other symbols. This is a list of letters of the ...
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The symbol for the centaur Chiron, ⚷, is both a key and a monogram of the letters O and K (for 'Object Kowal', a provisional name of the object, for discoverer Charles T. Kowal) was proposed by astrologer Al Morrison, who presented the symbol as "an inspiration shared amongst Al H. Morrison, Joelle K.D. Mahoney, and Marlene Bassoff."