Alliance Galactic Stellar Classification

This is the stellar classification used by the Alliance in AI Legacies. The system uses a heat scale and a size scale. The heat scale is in the order QOBAFGKMLTY, followed by a 0-9 of hottest-coolest. The size scale is in the order xhysgbidenz, and is followed by a 0-9 of largest-smallest. Therefore, a star might have a class of G5b6, or simply Gb. Neutron stars are further classified by pulse, with a number from 0-9, 0 being no pulse, and 9 being extremely quick pulse, with the addition of a U or D depending on it's spin. They are further classified into the type of pulse they emit, so that it's classification might be z2D4r.

xhysgbidenz
x-size stars are incredibly massive, beyond hypergiant status.

h-size stars are of hypergiant stature.

y-size stars are in-between hypergiants and supergiants.

s-size stars are supergiants.

g-size stars are giants.

b-size stars are large main-class stars.

i-size stars are about the size of Sol.

d-size stars are dwarves.

e-size stars are superdwarves.

n-size stars are hyperdwarves.

z-size stars are most neutron stars, though some fit within n.

Black hole classifications
Black holes are again classified differently. They are classified by their mass, in the order of HSIBK, followed by a number from 0-9 to further designate the mass from smallest to largest.