The product name often consists of a combination of a number and several letters.
The first part indicates the type of distributor, so whether it is a switch, USB, or Bluetooth version. This is often followed by a number; this indicates for how many cylinders the distributor is suitable. Then there is an R or an A; this indicates whether the distributor cap is Straight or Angled. This is sometimes followed by a V, for vacuum advance. The letter that follows sometimes indicates the car make for which this distributor is suitable. Finally, we have distributors with IE on the end; these are suitable for injection.
NB; there are many exceptions, where one of the letters is missing from the name, or which have a special name. If you want to know whether an ignition is suitable for your application, look at the product description, specifications, and especially check the dimensions (these are often stated on one of the product photos).