On Friday, 22 May 2020 18:37:34 UTC+1, NY wrote:
I happened to come across this symbol which I've never seen before, and it
took several attempts to find an Ordnance Survey Legend web page that
included it.

Even looking it up, I'm not completely sure, but I have a very poor short term visual memory.

Solar farm?

There's a guide to new symbols here

https://www.thepoke.co.uk/2015/08/04...y-map-symbols/