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  2. Staurogram - Wikipedia

    en.wikipedia.org/wiki/Staurogram

    The staurogram is encoded by Unicode in the Coptic block, at U+2CE8 ⳨ COPTIC SYMBOL TAU RO, and as of Unicode 7.0 (2014) also in the Ancient Symbols block, at U+101A0 𐆠 GREEK SYMBOL TAU RHO. The Coptic block has a ligature of the full word σταυρός, where the τρ is represented by the staurogram, and two lunate sigmas are attached ...

  3. Tau - Wikipedia

    en.wikipedia.org/wiki/Tau

    Tau in astronomy is a measure of optical depth, or how much sunlight cannot penetrate the atmosphere. In the physical sciences, tau is sometimes used as time variable, to avoid confusing t as temperature. Time constant (also relaxation time) of any system, such as an RC circuit. Torque, the rotational force in mechanics.

  4. Alt code - Wikipedia

    en.wikipedia.org/wiki/Alt_code

    Alt code. On personal computers with numeric keypads that use Microsoft operating systems, such as Windows, many characters that do not have a dedicated key combination on the keyboard may nevertheless be entered using the Alt code (the Alt numpad input method). This is done by pressing and holding the Alt key, then typing a number on the ...

  5. Christian symbolism - Wikipedia

    en.wikipedia.org/wiki/Christian_symbolism

    A staurogram used as τρ-ligature part of the spelling of the word σταυρον (as ϲ(τρ)ον) in Luke 14:27 (Papyrus Bodmer XIV-XV, 2nd century) The Staurogram ⳨ (from the Greek σταυρός, i.e. cross), also Monogrammatic Cross or Tau-Rho symbol, is composed by a tau (Τ) superimposed on a rho (Ρ).

  6. Greek letters used in mathematics, science, and engineering

    en.wikipedia.org/wiki/Greek_letters_used_in...

    t. e. Greek letters are used in mathematics, science, engineering, and other areas where mathematical notation is used as symbols for constants, special functions, and also conventionally for variables representing certain quantities. In these contexts, the capital letters and the small letters represent distinct and unrelated entities.

  7. Greek script in Unicode - Wikipedia

    en.wikipedia.org/wiki/Greek_script_in_Unicode

    Blocks. As of version 16.0 of the Unicode Standard, 518 characters in the following blocks are classified as belonging to the Greek script: [1] Greek and Coptic: U+0370–U+03FF (117 characters) Phonetic Extensions: U+1D00–U+1D7F (15 characters) Phonetic Extensions Supplement: U+1D80–U+1DBF (1 character: U+1DBF MODIFIER LETTER SMALL THETA ...

  8. Astronomical symbols - Wikipedia

    en.wikipedia.org/wiki/Astronomical_symbols

    The use of astronomical symbols for the Sun and Moon dates to antiquity. The forms of the symbols that appear in the original papyrus texts of Greek horoscopes are a circle with one ray () for the Sun and a crescent for the Moon. [3] The modern Sun symbol, a circle with a dot (☉), first appeared in Europe in the Renaissance.

  9. Stigma (ligature) - Wikipedia

    en.wikipedia.org/wiki/Stigma_(ligature)

    t. e. Stigma (ϛ) is a ligature of the Greek letters sigma (Σ) and tau (Τ), which was used in writing Greek between the Middle Ages and the 19th century. It is also used as a numeral symbol for the number 6. In this unrelated function, it is a continuation of the old letter digamma (originally Ϝ, cursive form ), which had served as a numeral ...