Industrial scale
The industrial scale was a system used to rate the extent of industrial development on different planets. 

The Federation utilized an industrial scale system during the 23rd century that was scaled by either letters or numbers.

Ratings:
B: Earth equivalent 1485
G: Earth equivalent 2030
7: A civilization of high order

During the late 2260s, the planet Sigma Draconis III rated letter "B", and the planet Sigma Draconis IV rated letter "G". () Scalos was rated number "7". ()

See also
 Pre-industrial
Richter's scale of cultures
Technological rating

fr:Échelle d'industrialisation
Measurements