Ell wide. Ell An ell (from Proto-Germanic *"alinō", cognate with Latin "ulna") is a unit of measurement, originally a cubit, i.e., approximating the length of a man's arm from the elbow ("" literally meant the bend ("bow") of the arm ("ell")) to the tip of the middle finger, or about 18 inches (457 mm); in later usage, any of several longer units. In English-speaking countries, these included (until the 19th century) the Flemish ell ( of a yard), English ell ( yards) and French ell ( yards), some of which are thought to derive from a "double ell". An ell-wand or
Finger tip unit the UK, Belgium, Turkey, India, Iran, Pakistan, Malaysia and the USA. 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