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  2. Degree symbol - Wikipedia

    en.wikipedia.org/wiki/Degree_symbol

    In the case of degrees of angular arc, the degree symbol follows the number without any intervening space, e.g. 30°.The addition of minute and second of arc follows the degree units, with intervening spaces (optionally, non-breaking space) between the sexagesimal degree subdivisions but no spaces between the numbers and units, for example 30° 12 ′ 5″.

  3. Quadratic formula - Wikipedia

    en.wikipedia.org/wiki/Quadratic_formula

    When ⁠ ⁠ has the opposite sign as either ⁠ + ⁠ or ⁠ ⁠, subtraction can cause catastrophic cancellation, resulting in poor accuracy in numerical calculations; choosing between the version of the quadratic formula with the square root in the numerator or denominator depending on the sign of ⁠ ⁠ can avoid this problem.

  4. Star (glyph) - Wikipedia

    en.wikipedia.org/wiki/Star_(glyph)

    APL functional symbol circle star ⍟ U+235F APL functional symbol star diaeresis ⍣ U+2363 black star ★ U+2605 white star ☆ U+2606 star and crescent: ☪: U+262A outlined white star ⚝ U+269D pentagram ⛤ U+26E4 right-handed interlaced pentagram ⛥ U+26E5 left-handed interlaced pentagram ⛦ U+26E6 inverted pentagram ⛧ U+26E7 stress ...

  5. Planet symbols - Wikipedia

    en.wikipedia.org/wiki/Planet_symbols

    A planet symbol or planetary symbol is a graphical symbol used in astrology and astronomy to represent a classical planet (including the Sun and the Moon) or one of the modern planets. The symbols were also used in alchemy to represent the metals associated with the planets , and in calendars for their associated days.

  6. Service mark symbol - Wikipedia

    en.wikipedia.org/wiki/Service_mark_symbol

    The service mark symbol ℠ (the letters SM in small capitals and superscript style), is a symbol used in the United States and some other jurisdictions to provide notice that the preceding mark is a service mark. This symbol may be used for service marks not yet registered with the relevant national authority.

  7. Upside-down question and exclamation marks - Wikipedia

    en.wikipedia.org/wiki/Upside-down_question_and...

    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?"

  8. Latin-1 Supplement - Wikipedia

    en.wikipedia.org/wiki/Latin-1_Supplement

    The Latin-1 Supplement (also called C1 Controls and Latin-1 Supplement) is the second Unicode block in the Unicode standard. It encodes the upper range of ISO 8859-1: 80 (U+0080) - FF (U+00FF).

  9. Null sign - Wikipedia

    en.wikipedia.org/wiki/Null_sign

    The English language was a fusional language, this means the language makes use of inflectional changes to convey grammatical meanings. Although the inflectional complexity of English has been largely reduced in the course of development, the inflectional endings can be seen in earlier forms of English, such as the Early Modern English (abbreviated as EModE).