USI
Overview
Universal Stylus Initiative: https://universalstylus.org/
The Universal Stylus Initiative is (was?) an organization to create apparently some kind of stylus specification. Ultimately, few styluses are USI and those that are are poor quality compared to a traditional EMR pen. I highly recommend avoiding devices that use a USI stylus.
Resources
Logitech - What Is USI and How It Can Help Educators
USI - USI Launched to Create a Specification for an Active Stylus (archive) 2015/04/23
r/chromeos - Those of you who have a USI pen/stylus, what are your thoughts/impressions? 2021/01/11 (archive)
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