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the theme of DEV_IS and its first unit ReGLOSS is building something from broken stuff.
DEV_IS comes from "debris", that's why it's separated by an underscore instead of dash, hyphen, or just a space.
DEBRIS -> DEB_IS
then DEB or デブ is stylistically changed to DEV, for the meaning behind "development".
this represents the girls who have, at some point in their lives, been destroyed and torn down into debris, either from a life changing tragedy, or dreams that have been shattered by the cruel reality of modern day life.
ReGLOSS comes from "regrowth" and GLOSS is capitalized to emphasize the "growth" of the idols in the unit.
it is then stylistically changed to "gloss" to represent the final goal, the end destination, of polishing these broken girls to a "glossy sheen"
in other words, in a couple years when Raden starts doing idol dances live on stage, she will have stopped smoking, drinking, gambling, to the cheer of all her idol fans supporting her "regrowth" from her initial state resembling debris of a human being
