You are in The Observatory.
Ground you have walked is named. The rest is drawn but unnamed — it is waiting, not missing, and nothing is required of you to find it.
Every realm is named here, and its rooms fold open beneath it. The mark beside a name says which ground you have already walked.
Every door stays where you left it. Esc folds the map.
Short form of version, and of value. A named abbreviation rather than a concept.
no historical meaning recorded yet
A single-letter shorthand doing double duty for version and for value, its meaning decided entirely by where it sits.