It is symbol for "contract" which is used almost universally by lawyers and law students.
The taking of a person against his/her will or from the control of a parent or guardian from one place to another under circumstances in which the person so taken does not have freedom of movement, will, or decision through violence, force, threat or intimidation. Although it is not necessary that the purpose be criminal since all kidnapping is a criminal offence. The capture usually involves some related criminal act such as holding the person for ransom, sexual and/or sadistic abuse, or rape. It includes taking due to irresistible impuls. Originally it meant the stealing of children, since "kid" is child in Scandinavian languages, but now applies to adults as well.
It means blood relative.