Unimedia had been a company providing cathode-ray tube displays to productions circa 1978 CE.
In Buck Rogers in the 25th Century, the Unimedia logo is seen on the bottom center frame of the monitor in Felina Redding's living quarters, and can be seen when the "2 MESSAGES" text message appears on the screen in Buck Rogers in the 25th Century's "Vegas in Space".
On close-up shots depicting playback of messages from Rita and Amos Armat, the logo's text is obfuscated, leaving only the rainbow gradient line beneath it untouched.