square stamp

nelinurkpitser, nelinurktempel

näiteid
http://l7.alamy.com/zooms/e8ae642b36e9400880ee8ab803183de8/passport-stamp-for-entry-into-new-zealand-cp0xjc.jpg

https://duckduckgo.com/?q=square+rubber+stamp&t=h_&iar=images&iax=images&ia=images