An argument side is a position taken in a debate or discussion. It can be either FOR or against a particular point of view. The three letter abbreviations PRO, CON, and FOR refer to the words 'pros' and 'CONS' which are used to describe the two sides of an argument. PROS stands FOR 'pros and CONS, ' which means both the positive and negative aspects of an argument. SPAT stands FOR 'spatially arranged argument tree, ' which is a visual representation of the different sides of an argument.