Dogtrousers
Kilometre nibbler
And signs with a green circle are advisory only. They have no legal enforcement, and do not override the ones with the red circle (or the NSL) sign, which indicate the legal limit.
I never knew that signs with a green circle were a thing. That's not surprising because I, along with a significant proportion of the population, am unlikely to be able to distinguish them from those with a green circle.
So if they are a thing, it's a pretty stupid thing.