Bill Bradford wrote: This has changed over time. The old logo, with square dot on the "i" and flat-topped "t", looked very much like Helvetica. It certainly isn't Univers, Franklin Gothic or Futura (all ruled out by the "a"). The newer logo (on my OpenVMS 6.1 manuals) has a round dot on the "i" and a diagonal top to the "t". I can't place this at the moment. I assume you're not talking about the PDP-1 logo, but about the very rounded logos of the PDP-8, -11, -12, etc. The roundness and even stroke widths place it closer to Avant Garde than anything else in my catalogues, though there is clearly some customisation of the digits and the letter "k" (I'm looking at a nice large scan of the cover of the PDP-11 Handbook from simulogics.com).