The payload/increment patch for STS-131 has been released and, as a footnote to NASA patch history, it is the second NASA patch to include Star Trek Klingon letters. These are the letters for "WORF" - one of the ISS payload racks going up on STS-131 (the Window Observational Research Facility).
The increment patch reflects the letters I used in designing the first NASA patch with Klingon for the WORF payload project back in 2001. Back then, I was part of the WORF design and development team at NASA Johnson Space Center, and spoke with Rick Berman's office in Hollywood to make certain that I wouldn't violate any Star Trek canon.
We agreed on the Klingon Klinshai, or Mandel, script that had appeared in "The U.S.S. Enterprise Officer's Manual" (no relation to the versions of spoken and phonetic Klingon out there) to spell out the name W-O-R-F.
After a lengthy delay following the Columbia accident, we're finally ready to launch. With any luck, late next week I'll have my art (via a WORF sticker on the front of the rack) on permanent display in a fairly exclusive orbital gallery.
In phonetic Klingon: DaHjaj 'oH [a] QaQ jaj Daq Puv! (Today is a good day to fly!)
— Tony Boatright
Below: WORF art, patch and rack installed in the multi-purpose logistics module.