A name is addressing, not identity. Two nodes under one parent may carry the same name; the resolution rule in Placement picks which one a pretty path shows and clients surface the collision. A node without a name is unnamed and reachable only by id, which is how private documents and comments avoid human-readable paths. Renaming is a new Node blob with a different name; nothing else changes. Names are compared byte for byte; clients should normalise to NFC before signing. The space root has no name.

A path segment, with the same character rules, but today the whole path is the identity and the permission scope. Stem keeps the segment and drops the rest.