Glucose has five chirality centers in the cyclic form and four in the acyclic form. If a compound has one chirality center, it can exist as mirror images. If it has two centers, then then four isomers can be formed, two of which are mirror images and two of which are diastereomers. Diastereomers are different compounds. Adding more chirality centers leads to more diastereomers, that is more compounds. (GET RAXL is an acronym for all C3-C5 sugars, glyceraldehyde, erythrose, threose, ribose, arabinose, xylose, and lyxose.)
So, the other (stereo)isomers of glucose are all different compounds and have different names. However, every form of glucose (by a different name) has a mirror image.
By degradation, all sugars have the same penultimate chirality center, its configuration is common to all. It would not make sense to refer to the configuration of C-1 of ribose as it is not chiral yet leads to two different isomers in glucose/mannose. The configuration of D-glucose, D-ribose, D-threose, and D-glyceraldehyde are all the same at C5, C4, C3, and C2, respectively. The name is consistent for all sugars as their absolute configuration are related to D-glyceraldehyde.
In nature, only the D-isomer is produced most commonly. So, glucose is referred to as D-glucose as that isomer with a specific chirality at C-5.