Object 
Cartesian Plane 
Mapping Diagram 

Numbers  Vertical or Horizontal Lines Lower case: $a,b,...$ 
Points on the Left or Right Axis Lower case:$a,b,...$ 

Ordered pair of numbers a,b

A Point
Pair of numbers: $(a,b)$ 


Point in Plane 
Bold face/ Upper case: $\bf P =
(p_1,p_2)$ 


Arrow in Mapping Diagram (vector) 
A Point
$ (v_1,v_2)$ 
Bold face/ Lower case: $
\bf v$ $= <v_1,v_2>$ Numbers on Axes: $v_1,v_2 $ 