Copyright © Oren Ben-Kiki 2001: All rights reserved. If this (or any other logo) is ever approved as "the" (or "a") logo for YAML, then there may be some restrictions/requests on how it should be used. In the mean while, don't, even if for some strange reason you actually like it.
I tried at making it as minimal as possible: use only black & white, straight lines, etc. At the same time I tried to make it "streamlined". So I turned it into a sort of futuristic vehicle with a "fin" on the left and a "canopy" on the right.
In the table it looks pretty overwhelming; when a single, reasonably sized version is used on its own the effect is different. Try it.