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  2. Unified numbering system - Wikipedia

    en.wikipedia.org/wiki/Unified_numbering_system

    Additionally, the increasing number of new alloys meant that the problem would only get worse. [1] In January 1971, an 18-month study recommended that a unified system would be possible and helpful. An advisory board was established in April 1972 to establish the Unified Numbering System (UNS). [2]

  3. 2-8-8-4 - Wikipedia

    en.wikipedia.org/wiki/2-8-8-4

    So, along with producing 40 new class T-3 4-8-2 type locomotives built in-house at its Mt. Clare shops in Baltimore, Maryland, the B&O took delivery of 30 class EM-1 Yellowstones in 1944 and 1945, the largest number and the smallest of this type built by Baldwin as well as the most modern.

  4. 1/2 + 1/4 + 1/8 + 1/16 + ⋯ - ⋯ - Wikipedia

    en.wikipedia.org/wiki/1/2_%2B_1/4_%2B_1/8_%2B_1/...

    In mathematics, the infinite series ⁠ 1 / 2 ⁠ + ⁠ 1 / 4 ⁠ + ⁠ 1 / 8 ⁠ + ⁠ 1 / 16 ⁠ + ··· is an elementary example of a geometric series that converges absolutely. The sum of the series is 1.

  5. Uniform number (American football) - Wikipedia

    en.wikipedia.org/wiki/Uniform_number_(American...

    Cornerback Dré Bly seen in 2007 with numbers visible on the front and shoulders of his uniform. In American football, uniform numbers are displayed on both the front and back of the jersey, and in many cases the sleeves, shoulder pad, or occasionally helmets. The numbers on the front and back are very large, covering most of the jersey.

  6. Wheel arrangement - Wikipedia

    en.wikipedia.org/wiki/Wheel_arrangement

    The main notations are the Whyte notation (based on counting the wheels), the AAR wheel arrangement notation (based on counting either the axles or the bogies), and the UIC classification of locomotive axle arrangements (based on counting either the axles or the bogies).

  7. Uniform number (Major League Baseball) - Wikipedia

    en.wikipedia.org/wiki/Uniform_number_(Major...

    Adrián Beltré wore uniform number 29 while playing for the Texas Rangers. His number was later retired by the team. In baseball, the uniform number is a number worn on the uniform of each player and coach. Numbers are used for the purpose of easily identifying each person on the field as no two people from the same team can wear the same number.

  8. Uniforms of the Union army - Wikipedia

    en.wikipedia.org/wiki/Uniforms_of_the_Union_Army

    A plate showing the uniform of a U.S. Army first sergeant, circa 1858, influenced by the French army. The military uniforms of the Union Army in the American Civil War were widely varied and, due to limitations on supply of wool and other materials, based on availability and cost of materials. [1]

  9. Padovan sequence - Wikipedia

    en.wikipedia.org/wiki/Padovan_sequence

    For example, P(6) = 4, and there are 4 ways to write 6 as a palindromic ordered sum in which no term is 2: 6 ; 3 + 3 ; 1 + 4 + 1 ; 1 + 1 + 1 + 1 + 1 + 1. The number of ways of writing n as an ordered sum in which each term is odd and greater than 1 is equal to P(n − 5). For example, P(6) = 4, and there are 4 ways to write 11 as an ordered sum ...