There's a good reason for that. Graffiti was....derivative of Unistroke, which was developed at PARC as, IIRC, part of the Parctab project. Xerox even sued.

https://news.ycombinator.com/item?id=12310029

Fun fact: You can implement a "classic" Unistroke recognizer just by dividing the character up into quadrants. Every glyph had a unique sequence of quadrant traversals. http://www.yorku.ca/mack/ExperimentSoftware/javadoc/ca/yorku...