Reuters Dataset Labels description the list of Reuters dataset labels are provided with the dataset and also available in varous online resources. Here is an example.
But I couldn't find what each of these labels actually means.
I was able to find out 'acq' is short for 'Acquisitions'. But yet don't know these ones:
dlr, gnp, bop
Is there a description availbale about what these labels represent?
Apparently the paper introducing the dataset mentions a list of &quot;online appendices&quot; (table 1 p 363) which seems to contain details about the categories. However I wasn't able to find these appendices in the additional material.

[edit] Since it appears that there is no existing source for the original list of topics, I think your best bet is to rely on an acronym dictionary. Based on Acronym Finder, given that the data is mostly about economic news, I think the most likely meaning for the three topics you mention are:

DLR: dollar
GDP: Gross Domestic Product
BOP: Balance Of Payments

You could check whether these are correct by looking at a few documents labelled with these topics in the dataset.