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Universal Stylus Initiative: https://universalstylus.org/
The Universal Stylus Initiative is, or was, an organization created to define a stylus specification. Ultimately, few styluses use USI, and those that do are poor quality compared to a traditional EMR pen. I highly recommend avoiding devices that use a USI stylus.
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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