Definition of tram. 1  1 : any of various vehicles: such asa : a carrier that travels on an overhead cable or railsb chiefly British : streetcarc : a boxlike wagon running on rails (as in a mine) 2  2 trams plural, chiefly British : a streetcar line.
The stamp is a hallmark and indicates it is made of 14 karat gold and the GCJ stands for 'George Carter Jessop'. Some of our pieces can have a Jessop's or GCJ stamp. Although there could be other makers who exist who also use GCJ.
G-codes are also called preparatory codes, and are any word in a CNC program that begins with the letter G. Generally it is a code telling the machine tool what type of action to perform, such as: 1  Rapid movement (transport the tool as quickly as possible through space to the location where it will cut).