R is the 18th letter of the modern English alphabet and the ISO basic Latin alphabet.  The descending stroke of the Latin letter R has fully developed by the 3rd century BC, as seen in the Tomb of the Scipios sarcophagus inscriptions of that era. At the same time, the letter P could now be written with its loop fully closed, assuming the shape formerly taken by R, In handwriting, it was common not to close the bottom of the loop but continue into the leg, saving an extra pen stroke. The loop-leg stroke shortened into the simple arc used in the Carolingian minuscule and until today. In Middle English, the name of the letter changed from /ɛr/ to /ar/, following a pattern exhibited in many other words such as farm

  • in sport – baseball, cricket the number of runs scored by a player
  • in law – ®  Registered trademark symbol
  • in liturgy – ℟ symbol for response in liturgy
  • in mathematics – the set of all real numbers
  • in showbiz – restricted
  • in chess – rook also called the tower
  • in polygraphy – stands for relevant

wikipedia, Encyclopædia Britannica, cavitas-oris.com

literki – www.cavitas-aris.com