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Question about brush sizes

Whilst browsing the BST I see a lot of Rooney brushes advertised as 3/2, 1 etc. Does this relate to the size? If so is there a thread anywhere which shows the size differences anywhere? Or if someone could oblige me and post a picture of different brush sizes compared to a Simpson Duke 3 which is my current go to so I can get an idea of different sizes in my head? Thanks in advance.
 
Here is a image from Vintage Blades

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Front row (left to right): 1/1, 1/2, 1/3
Back row (left to right): 2/1, 3/1, 3/2, 3/3
 
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