Metro's rolling stock was acquired in six phases, and each version of car is identified with a separate series number.

At least seven authentic versions of the Fourth Symphony have been identified.

Two early versions of the text have been identified by scholars:

This version is also identified as 11i v2.

The links between high viewing figures and rose-tinted versions of the past have obviously been identified by the programme makers.

However, the work was not published until 1534; and four distinct versions can therefore be identified:

So the alpha version of the 2.5 release might be identified as 2.5a or 2.5.

Modified versions were identified by a single letter suffix.

The current version of text is identified by a field in the dictionary data structure.

These versions can be identified by small "Van" label on the back door.