Xah Lee, 2007-12
Here is a logo i designed for the Qi (programming language).

SVG version: qi_lang_logo.svg.
Here are smaller sizes:
,
.
The following is Qi II design requested by Mark Tarver. The lambda is made connected.
The image is copyright © 2007 by Xah Lee. Feel free to use the logo for Qi language related things.
I hereby transfer the copyright of this design to Mark Tarver (the creator of Qi).