ward turn or twist

Loops, when there is a single backward turn, but no twist. Whorls, when there is a turn through at least one complete circle: they are also considered to include all duplex spirals." The abbreviations used in making a record of finger-prints are: u, arch, I, loop, w, whorl, i, loop with an inner (thumb side) slope, o, loop with an outer (little-finger side) slope. The ten digits are registered in four groups as follows, distinguished by capital letters A, the fore, middle, and ring fingers of the right hand; B, the fore, middle, and ring fingers of the left hand; C, the thumb and little finger of the right hand; D, the thumb and little finger of the left hand. G.'s whistle, a cylindrical whistle, attached to a comp e ible bulb, with a screw attachment by which the note can be changed; it is used to test the hearing.