English: The trimmer resistor.

PhotosEdit

SymbolsEdit

GOST 2.728-74Edit

English: The symbols according to GOST 2.728-74 (the state standart of Russia)
Русский: Условные графические обозначения в соответствии с ГОСТ 2.728-74
  The general usage
  For use with 2 contacts only
  For use as rheostat