That is for the purpose of defining a specific turnout, in this case with 'C' switches, Vertical rail and a 1:9.25 crossing. But all of this terminology is variable depending on the railway, the purpose, the era etc. Without specifying all of those variables, and perhaps not even then, you can't dogmatically state what is the right or the wrong word.
Whilst CV on Network Rail may be read as 'C switch' Vertical, on the DLR CV means 'Curved Vee' (as opposed to SV, 'Straight Vee') and is supplemented by the radius in metres. So on DLR the CV9.25 mentioned above becomes an SV245.
Keith