There is a very old post about this R question aready on this board if you did not know..
https://cbrforum.com/m_72391/tm.htm

Yer .. I think you have answered your own question Pete..
They were raced ..

Without any knowledge one would have to assume that the top of the range Honda's sports bikes were raced in most production class races every year since the first models, all around the world at the least mate

Gee I remember even the bad old CB750 being used as a production class racer before the first r series came out .... yer I am ancient

As for the Answer to the 6,000.000 dollar question ..Pete .
I have a feeling that you already know it and you are just playing with my head ...and I told you never play with my head ... its not well mate

For the record , popular concensus has it that honda only used the CBR as a model code with no specific meaning ... this also is hard to prove difinatvly ...

The CB seems to have been used to designate ( city bike ) by honda, but that to is a subject of some debate still .. CB is also suposed to be the ID for 4 inline , but again obviously the cb 125 250 350 450 were twins and singles which shoots that theroy down..

The R was aparently used to id their "Road racing" (yer I know that 2 R's) but the RR is again aparently used to id "Road racing Replicas" or just "Racing Replicas" both these points are also near imposible to verify without just taking someones word for it.. R is also suposed to designate "Race spec engine ?" part of the factory ID...

I tend to go with the top popular belief above that I just mentioned .. or any combination of all of them ...

From WikipediaThe Honda CBR models are a series of sport oriented motorcycles. Several of which (400RR,600RR,900RR,929RR,954RR and 1000RR) are marketed as Race Replica, hence the suffix "RR" after the engine size designation. With the exception of the single cylinder CBR125 and CBR150, all CBR motorbikes have inline engines (as compared to the V engines in the VT, VTR and VF/VFR series). Less sporting models with inline engines make up the CB Series.

Honda as near everyone knows , has made a career out of whacking an R at the end of ALL their top sport bikes...even the XR dirt bikes ...
I think without to much evidence you can come to the conclusion that it did not stand for Radical .. or Ready to win ... I think like 9 outta ten people agree the R is for Racing ....

Now the point of my little dumb question was to weed out a few that may think that they know for certain what it mean't...
The conjecture is very broad about what it means and I like hearing some of the dum **** ideas that people get into their heads about this topic...

I have had some weird and wonderful things told to me about what th R stands for , things like
CBR = Cross Beam Racer which most may have heard of .. it of course is one of the least likly alternatives .....

anyway ... Pete
The real question was if they were raced or not and they obviously were