At I/O 2022, Google mentioned that it was working on a Pixel tablet for next year, and such a device has now appeared on a Universal Stylus Initiative (USI) product list.
Google's upcoming Pixel Tablet may support the USI (Universal Stylus Initiative) standard among manufacturers, allowing it to use a range of third-party styluses, if a recently discovered entry on the USI certified product list is to be believed. The entry lists a device from Google with the product name "Tangor" and model number "Tablet," which are likely placeholder names for the Android- powered Pixel Tablet that Google announced earlier this month.
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USI is an industry-wide stylus standard that Google joined in 2018. It’s already supported by a number of Chromebooks, allowing them to be used with a variety of styluses from different manufacturers . However, while there are many proprietary stylus/Android tablet offerings (like Samsung ’s S Pen for its Galaxy tablets ), no tablets have been certified to work with the universal USI standard.
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Earlier this year, USI announced version 2.0 of the standard. This version includes a new wireless charging that could allow compatible styluses to be charged by simply placing them next to a supported device, similar to what Apple with the Apple Pencil 2 and select iPads. It's unclear which version of Google it might support.

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As 9to5Google notes, it seems odd that Google's tablet appeared so early in the USI database, since Google said it was targeting a 2023 release. According to the Wayback Machine, the listing first appeared sometime after January.
Source of information: theverge.com
