PCD (Pitch Circle Diameter) or Bolt pattern
-The diameter of an imaginary circle drawn through the center of each lug hole. Also referred to as the bolt pattern.
Here are some examples commonly used these days both Metric and Standard.
108 mm = 4.25 inch (4 1/4)
114.3 mm = 4.5 inch (4 1/2)
120.65 mm = 4.75 inch (4 3/4)
127 mm = 5 inch
