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2. Line marker (sports) - Wikipedia

   en.wikipedia.org/wiki/Line_marker_(sports)

   Transfer wheel line marker. A line marker is a device or machine with which lines or markings are drawn on a sports field or pitch. They were originally developed to mark out lawn tennis courts on grass, but later also became used in many other sports with outdoor pitches. The marked lines are often white, but may be any color.

3. Penalty flag - Wikipedia

   en.wikipedia.org/wiki/Penalty_flag

   Officials point at a penalty flag lying on the field. The penalty flag (or just "flag"), often called a penalty marker (or just "marker"), is a yellow cloth used in several field sports including American football, Canadian football, and lacrosse by game officials to identify and sometimes mark the location of penalties or infractions that occur during regular play.

4. 44th and Parkside Ballpark - Wikipedia

   en.wikipedia.org/wiki/44th_and_Parkside_Ballpark

   The P.R.R. YMCA Athletic Field, also known as Penmar Park and commonly referred to in the 1930s and 1940s as the 44th and Parkside ballpark, was an athletic field and ballpark in West Philadelphia from as early as the 1890s to the early 1950s. It was built by the Pennsylvania Railroad YMCA for use by its employees.

5. 1st & Ten (graphics system) - Wikipedia

   en.wikipedia.org/wiki/1st_&_Ten_(graphics_system)

   The idea of creating an on-field marker to help TV viewers identify first down distances was conceived and patented in 1978 by Naval Oceans System Command engineer David W. Crain, [8] [9] who presented the concept to Roone Arledge and Roger Goodman of ABC News and Sports and to the CBS Technology Center. At the time, both decided the broadcast ...

6. Sportsman's Park - Wikipedia

   en.wikipedia.org/wiki/Sportsman's_Park

   The center field area was a short diagonal segment connecting the two longer walls. When distance markers were first posted, there was a 426 marker at the left corner of that segment, and a 422 marker at the right corner of it. There was another 422 marker a few feet to the left of the other one, and that marked "true" center field.

7. Penalty card - Wikipedia

   en.wikipedia.org/wiki/Penalty_card

   A blue card is frequently used in indoor football in the United States as a level below a yellow card for offenses such as breaking house safety rules, spitting on the field, committing minor physical fouls, or illegal substitutions, [23] signifying that the offender must leave the field and stay in a penalty box (usually 2–5 minutes), during ...