RKO (Radio-Keith-Orpheum) Pictures is an American film production and distribution company referenced in both The Rocky Horror Show and it's film adaptation, The Rocky Horror Picture Show. The lyric "by RKO" is heard during the final verse of the opening song, "Science Fiction, Double Feature".
The tower logo that appeared as the beginning title card of each film released "by RKO" is parodied in the final act of The Rocky Horror Picture Show, most notably as Rocky Horror (A Creation) carries his love, Dr. Frank-N-Furter, up the tower in an homage to King Kong (which was an RKO film). An early callback at Audience Participation was to say "A Richard K O'Brien Radio Picture" as the set is revealed before "Don't Dream It, Be It."
The end title card of of each film released "by RKO" features a Lightning Bolt.