[tz] Looking for details on timezones “right/…”

Hello, Today I stumbled upon timezone strings like “right/UTC”, “right/America/Jujuy”, and so forth, but I’m unable to find details on the meaning & classification of the “right/” here and how it relates to actual UTC and other timezones. I’d appreciate pointers or clarifications. Thank you kindly, Jens -- Jens Tröger https://savage.light-speed.de/