★★ Load Rating

★★
Radial off-the-road load ratingTwo stars — a higher load capacity at a higher inflation.
The same casing size rated to carry more, because it is run harder.
PR
Why not a ply ratingStars replace ply on a radial
A cross-ply off-the-road tyre states a ply rating; a radial states stars. They mark load capacity at a minimum recommended inflation rather than counting anything.
?
Not stated hereThe ply equivalent and the pressures
Those come from the tyre maker's own conversion table for that size, and this app does not hold one. A guessed figure here is a pressure somebody would actually inflate to, so there is none.

Standardised by ETRTO or TRA.