What is the meaning of the text inside this AMS logo?

The image is from here, and the logo seems to have been frequently used until the 80's. The text is

ΑΓΕΩΜΕΤΡΗΤΟΣ ΜΗ ΕΙΣΙΤΩ

but Google translate and Googling have not helped.

Added: (07-11-2019) Who is the author (designer/ suggester) of this AMS logo?