term:

Share

share n

1 : a portion belonging to, due to, or due from an individual [a joint tortfeasor is liable for her of the damages]
;specif
: the part allotted or belonging to one of a number owning together any property or interest [the of a joint tenant] [his passed to his widow]
2 a : any of the equal interests into which ownership of something (as a fund) is divided
;specif
: any of the equal interests or rights into which the entire capital stock of a corporation is divided
b : a certificate representing such a share