Car appreciation... the aesthetics, the engineering, etc

Yes, it's just trikes. You would have nothing in the 4rd column (labelled 12. why DVLA, why?) if you had passed your bike test.

This has come about because trikes used to come under category B but have now been moved to category A. Those people who had cat B before the change, like yourself, will get this. No new entitlement, just a change in classification.

I just got my licence re-issued and they've updated the entitlement section:

Which includes Cat A, which according to this: https://www.gov.uk/driving-licence-categories

Is:

Category A

You can drive:

motorbikes with a power output more than 35kW or a power to weight ratio more than 0.2kW/kg
motor tricycles with a power output more than 15kW

I've never passed a motorcycle test, so is this just referring to motor-tricycles (which sound cool)?