Their correct name was tokubetsu kÅ geki tai ( ç å æ '' '' æ ' é ) , which literally means `` special attack unit . '' In Japanese , the formal term used for units carrying out suicide attacks during 1944 â `` 45 is tokubetsu kÅ geki tai ( ç å æ '' '' æ ' é ) , which literally means `` special attack unit '' .