Disk galaxies
type: Concept
narrower: Lenticular galaxies

Hubble classification scheme
type: Concept
related: Lenticular galaxies

Lenticular galaxies
type: Concept
related: Hubble classification scheme
related: De Vaucouleurs Sandage classification
alternative label: S0 galaxies
broader: Disk galaxies

De Vaucouleurs Sandage classification
type: Concept
related: Lenticular galaxies