Conceptual Diagram Symbol Libraries from the Integration and Application Network

"The IAN symbol libraries contain over 1500 custom made vector symbols (in 32 categories) designed specifically for enhancing science communication skills. The libraries are designed primarily for use with Adobe Illustrator (requires version 10 or better), however we also offer eps and svg versions for non-Illustrator users. The symbols allow diagrammatic representations of complex processes to be developed easily with minimal graphical skills."