There are eight different types of scratches that are described within the Kama Sutra, each based on a certain way of pressing the nails into the skin.
Sounding
Pressing in the nails so that no mark is made
Half Moon
Leaving a curved mark along the neck and breasts
Circle
Two half-moons created beside each other
Line
A scratch that is made in the shape of a line
Tiger’s Nail
A curved scratch made on the breast
Peacock’s Foot
A curved mark made by pressing all 5 nails into the breast
The Jump of a Hare
A scratch-made with all 5 nails near the nipple
Leaf of a Blue Lotus
A mark made in the shape of a lotus near the breast. These marks are all designed to be placed in hidden locations across the body, particularly on the breast, so that they are only seen by the two lovers and by no one else. They are there to remind the person of their lover and to excite them whenever they gaze upon each mark.