A triangle pointed-down means I must yield to other traffic. Sometimes it says "yield" or "give way".
A circular sign with a red edge means whatever is reported is prohibited.
What then does it mean to have a circular sign with a red edge and the text "give way"? Literally, it would seem to be "prohibited to give way", which would be a very odd way to say "you have the right of way". See, for example, this Google Streetview image.