Generally speaking, when two spur gears are in mesh, the gear with more teeth is named the "equipment" and the one with the smaller number of the teeth is called the "pinion."
Guud ahaan marka laba spar gears ay ku jiraan mesh, qalabka ilkaha oo badan waxaa loo yaqaan "gear" halka midka ugu yar ee ilkaha ah waxaa loo yaqaan "pinion."