What does the 91T mean on a tire example 205 60 R16 91T BSW?

What does the 91T mean on a tire example 205 60 R16 91T BSW?
It means, that this tyre is for vehicles with a speed capability not exceeding 190 Km/h (119 Mph)

more information: http://www.tyresave.co.uk/tyrspeed.html