For example, a radial loop is common on the index finger, but extremely rare on the little finger. Check out the order below from most common to least.
Whorl = a spiral pattern . Very common, especially on the thumb, index and ring fingers
Radial Loop = a loop that comes from the thumb side of the hand . Commonly found on index finger, uncommon on middle finger, rare on other fingers
Double Loop = two loops going in two directions, but is actually a type of whorl . Uncommon pattern on all fingers except thumb; rare on ring and little fingers
Peacock's Eye = a tiny whorl inside a loop . Uncommon pattern on: all fingers, most common on ring finger, rare on thumb.
Accidental = anything else, such as horizontal rather than vertical loops . Rare on index finger, extremely rare on all other fingers.