As far as I know from CORBA and RMI the code in client that resembles the server's (the other side's) interface is called stub. In these two technologies the code that we put in client side (caller) and act as a proxy or server interface (callee) is called stub. clients call stub's methods in order to excecute some code in the server. its counterpart in server side is called skeleton.
read this for RMI : www.ccs.neu.edu/home/kenb/com3337/rmi_tut.html