I have avoided this as it seemed like an awfully-specfic offshoot, but now I am aware of such a number of ways of communicating gesture in diagramming that I cannot ignore it anymore. I have made this new category, in the hopes it makes sense and other types of symbol communications will become available (or known to me) in the future.
If you go looking for this in the book, you won't find it. Came a couple weeks too late for that.
Gesture
Cue Gesture Icon System by P.J. Onori, someRandomDude. (PNG, SVG Omnigraffle Stencil, InDesign)
Gesture Icons by Ryan Lee, paid download, for multiple platforms. Includes some kinesthetic gestures. (PDF, Illustrator, EPS)
Touch Gesture Reference Guide by Luke Wroblewski. Set of stencils and other supporting documentation for understanding gesture. (PDF, EPS, OmniGraffle, Visio)
Open Source Gesture Library by GestureWorks. Usable icons plus posters and other documentation. (PNG, PDF, EPS plus Gesture Font Family in TTF/OTF)
GestureIcon Touch Pack by Ron George. Very abstracted icon set. (EPS, PNG, Illustrator)
Touchscreen Stencils distributed by Kicker Studio, drawn by Rachel Glaves for Dan Saffer's book Designing Gestural Interfaces. (OmniGraffle, Illustrator, Photoshop, Visio, Fireworks, Axure).
Touch Notation by Matt Legend Gemmell, another very abstracted system. (Photoshop, Illustrator, OmniGraffle)
Mobile Design Templates by Steven Hoober, a few pages of this large library include gesture icons, on-screen and kinesthetic. Used in the book Designing Mobile Interfaces (PDF, InDesign is in section above).
http://www.mobiletuxedo.com/touch-gesture-icons/Touch Gesture Icons by Mobile Tuxedo. PSD and EPS vector files, plus pre-rasterized PNGs in several sizes.
Animated Touch Gestures by Areus Wade. Really, animated. Quicktime thingies for video and they say Photoshop. Never tried it.