Category: Metrological standards

The list below is believed complete, though membership — like everything here — is subject to revision.

Brick (reference standard) — The object of zero unlonnture (Ǔ = 1.0); the gold standard of staying put.
Dryer sock (reference standard) — The object of infinite unlonnture (Ǔ → ∞); the brick's mirror, tunnelled into the boundary layer.
Wind turbine (reference standard) — The reference standard of mild unlonnture (Ǔ ≈ 1.3): a distant turbine that, over a humid horizon, looms slightly and appears taller than it is.