Global notation
Global notation is a musical notation system designed by Andrew Killick in 2016, and still under development to this day, that aims to allow the representation of any kind of music in the world while being as easy to learn and use as possible. By making every musical element optional, this notation system makes sure a score contains all the intended information, no more and no less. This includes various ways to convey specified and unspecified pitch, rhythm, dynamics, timbre, etc.
In this system, pitch is notated on a vertical logarithmic axis, i.e. intervals of the same size occupy the same vertical space. There are multiple ways to indicate absolute pitch and relative pitch. Killick provides most of his examples with cent deviations from 12edo pitches, but also mentions that other ways to communicate intervals, such as interval ratios, could be used as well.