Logos decorate and epitomize.
Those I've done each depict some facet of the project it identifies.

For a website on spiral development
Andrew Logo
For the Andrew website.
For a nascent set of physics lessons.
(Energy equals Mass in natural units.)

For my "Brew" macro processor, ,
developed (at Starbuck's) for the E=M project.

The logos below all spell "EPIC" and were created as options for the EPIC team. The wedge shape is emblematic of EPIC's process of narrowing options while refining toward a solution, so the team chose the one in the box.