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  2. Mathematical operators and symbols in Unicode - Wikipedia

    en.wikipedia.org/wiki/Mathematical_operators_and...

    The Arrows block (U+2190–U+21FF) contains line, curve, and semicircle arrows and arrow-like operators. The math subset of this block is U+2190–U+21A7, U+21A9–U+21AE, U+21B0–U+21B1, U+21B6–U+21B7, U+21BC–U+21DB, U+21DD, U+21E4–U+21E5, U+21F4–U+21FF.

  3. Old-fashioned doughnut - Wikipedia

    en.wikipedia.org/wiki/Old-fashioned_doughnut

    Old-fashioned doughnuts – cinnamon sugar (left), chocolate glazed (centre top) and maple glazed (right). Shape shown is typical of commercially available buttermilk donuts. The old-fashioned doughnut is a term used for a variety of cake doughnut prepared in the shape of a ring with a cracked surface and tapered edges around it. [1]

  4. Torus - Wikipedia

    en.wikipedia.org/wiki/Torus

    A ring torus with aspect ratio 3, the ratio between the diameters of the larger (magenta) circle and the smaller (red) circle. In geometry, a torus ( pl.: tori or toruses) is a surface of revolution generated by revolving a circle in three-dimensional space one full revolution about an axis that is coplanar with the circle.

  5. d'Alembert operator - Wikipedia

    en.wikipedia.org/wiki/D'Alembert_operator

    d'Alembert operator. In special relativity, electromagnetism and wave theory, the d'Alembert operator (denoted by a box: ), also called the d'Alembertian, wave operator, box operator or sometimes quabla operator [1] ( cf. nabla symbol) is the Laplace operator of Minkowski space. The operator is named after French mathematician and physicist ...

  6. List of logic symbols - Wikipedia

    en.wikipedia.org/wiki/List_of_logic_symbols

    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.

  7. List of Boeing customer codes - Wikipedia

    en.wikipedia.org/wiki/List_of_Boeing_customer_codes

    Boeing 737 Next Generation: line number 6082. Boeing P-8 Poseidon: line number 6020. Boeing 747-8: line number 1534. Boeing 767: line number 1102. Boeing 777: line number 1422. Furthermore, customer codes have never been used for Boeing airplane models launched after the termination of customer codes, namely the 787, 737 MAX and 777X .

  8. APL syntax and symbols - Wikipedia

    en.wikipedia.org/wiki/APL_syntax_and_symbols

    APL is going to execute from right-to-left. Step 1 {of topmost APL code entered at left}) 4-5 = -1. Step 2) 3 times -1 = -3. Step 3) Take the floor or lower of 2 and -3 = -3. Step 4) Divide 1 by -3 = -0.3333333333 = final result. An operator may have function or data operands and evaluate to a dyadic or monadic function.

  9. Have Doughnut - Wikipedia

    en.wikipedia.org/wiki/Have_Doughnut

    Have Doughnut. Have Doughnut flying in 1968. NASIC document describing the program. Have Doughnut was the name of a Defense Intelligence Agency project whose purpose was to evaluate and exploit a MiG-21 "Fishbed-E" that the United States Air Force acquired in 1967 from Israel. Israel acquired the aircraft as the result of its Operation Diamond ...

  10. List of airline codes (J) - Wikipedia

    en.wikipedia.org/wiki/List_of_airline_codes_(J)

    Airline codes IATA ICAO Airline Call sign Country Comments JTN JET TEST United States JGJ Jinggong Jet: GLOBAL JINGGONG China 2014, 2023: JNY Journey Aviation: ROCKBAND United States 2023: Callsign "ROCKBAND"; Former Call Sign/Telephony Designator: UNIJET-ROCKBAND (2014) JKR Justice Air Charter: JOKER United States

  11. List of airline codes (I) - Wikipedia

    en.wikipedia.org/wiki/List_of_airline_codes_(I)

    United States. I2. IBS. Iberia Express. IBEREXPRESS. Spain. Charter service, low cost carrier for EU flights of Iberia operating only A320s. IBR. Ibertour Servicios Aéreos.