No delta. An arch with a sharp corner at the top point, resembles a triangle.
No delta. An gentle slope up with a more rounded top point, like a small hill.
A loop pointing towards the pinky
A loop pointing towards the thumb.
In the twinned loop pattern, the recurving ridges present two loop formations, separate and apart. There are two points of delta. The flows for the deltas originate from the same side of the pattern.
Lateral pocket loop
In the lateral pocket loop pattern, the recurving ridges present two loop formations, separate and apart. There are two points of delta. The flows for the deltas originate from the same side of the pattern.
Most important to know: sometimes simply referred to as "whorl".
Central Pocket Whorl
The central pocket whorl pattern consists of one or more free recurving ridges and two points of delta.
The accidental pattern will contain two points of delta. Rarely tested.
The composite pattern is composed of two or more different patterns, separate and apart exclusive of the arch.
Triangles made from ridges.
The Arch pattern is made up of ridges lying one above the other in a general arching formation.
In order to distinguish between ulnar and radial loops you must: 1) know from which hand the loop pattern comes from and; 2) place your hand palm side down over top of the impression and determine if the recurving ridges originate from the little finger side or the thumb side.
If the ridges flow in from the little finger side this would be an 'ulnar' loop. If the ridges flow in from the thumb side this would be a 'radial' loop.
Whorls have two deltas and look like a target.
An Island is a line-type which stands alone.
Bifurcations are splitting lines in the pattern.
Is the approximate center of the finger pattern impression
An Ellipse is a circular or oval shaped line-type which is generally found in the center of Whorl patterns.