α-D-glucose and β-D-glucose are
D-glucose has two anomers, alpha and beta varieties. These anomers are produced by the spatial configuration with reference to the first carbon atom in aldoses and second carbon atom in ketoses. Hence, these carbon atoms are known as anomeric carbon atoms.
Reference: Vasudevan 7th  ed, pg 72
Stereoisomers
Epimers
Anomers
Keto-aldo pairs