PROTIUM
Building a hydrogen-based unit system.
The name
PROTIUM is named for protium — hydrogen-1, the lightest isotope, the single-proton, single-electron atom. The name is not an acronym or a coinage: it is the physical anchor wearing its own name.
The ☉ symbol (U+2609) appears throughout PROTIUM as the protium mark. It denotes the protium atom when part of defined PROTIUM units and other framework defined terms.
What it is
A measurement and notation system in which every unit is anchored to a single physical phenomenon: the hydrogen-1 21 cm hyperfine transition. One atomic event supplies three axes — time, distance, and energy. The proton that produces the transition supplies the fourth: mass. The design goal is a unit system any independently-developed receiver could reconstruct from hydrogen alone — no anthropocentric conventions required.
Four axes from one atom
Three of the four axes are three views of the same hyperfine flip:
Ht☉ Time — the period of the transition.
Hl☉ Distance — how far light travels in that period.
He☉ Energy — the photon the flip emits.
Hm☉ Mass — the proton itself, anchored independently by dynamics rather than photon counting.
All four are independently anchored to hydrogen — each separately verifiable by a receiver. That overdetermination is the point: a receiver can cross-check the axes against each other, confirming it has reconstructed the system correctly.
Prior art
The Voyager Golden Record (1977) established hydrogen’s hyperfine transition as a universal time reference. PROTIUM extends this foundation: named scale units that bridge atomic and human regimes, conjugate axes derived from the same transition, and multi-event calibration for independently verifiable measurement.