Obsolete Russian units of measurement Peter the Great replace it with the Hindu-Arabic numeral system. The basic unit is the Russian cubit, called the "arshin", which has been in use since the 16th century. It was standardized by Peter the Great in the 18th century to measure exactly twenty-eight English inches (). Thus, 80 vershoks = 20 piads = 5 arshins = 140 English inches (). A "piad" (, “palm”, “five”) or "chetvert" (, “quarter”) is a hand span, the distance between ends of the spread thumb and index finger. Alternative units: As in many ancient systems of measurement the Russian distinguishes between dry and
Finger tip unit Finger tip unit In medicine, a finger tip unit (FTU) is defined as the amount of ointment, cream or other semi-solid dosage form expressed from a tube with a 5mm diameter nozzle, applied from the distal skin-crease to the tip of the index finger of an adult. The "distal skin-crease" is the skin crease over the joint nearest the end of the finger. One FTU is enough to treat an area of skin twice the size of the flat of an adult's hand with the fingers together, i.e. a “handprint”. Two FTUs are approximately equivalent to 1g of topical steroid.