The rainbow bridge of Norse sky — this house's name for a crossing between realms that only the worthy walk.
Old Norse Bifrost, most often read as bifa (to shake, to quiver) + rost (a stretch of road) — 'the shivering road' — though a rival reading takes it as bil-rost, 'the fleeting road'; both agree it named the rainbow bridge to Asgard, and neither is fully settled.
A crossing between realms open only to those judged worthy of it — this house's name for a passage not offered to everyone who wants it.