Suppose I am told that the pie costs £2.

I have £2 in my pocket.

You have £2 in your pocket.

Which £2 does it cost?

Well - either. When you say a thing costs £2 you leave it open whose or which £2!

'Token' is used when it matters in philosophical contexts whether you are saying the £2 in my pocket or the £2 in general as it were that the thing costs.

I have a token £2 in my pocket. You have another token £2 in your pocket. The general £2 in the assertion that the pie costs £2 doesn't refer to a token at all. It is saying something more general.

Similarly, take the belief that Fodor is a difficult writer. Some people say if you have that belief, and I have it also, then you have a token of that belief in your mind or head, and I have another token of the same belief.