A staircase is a flight of steps for ascending from one floor to a higher floor in a building. It’s a period charge, found in the canting arms (Italian gradino, “step”) of Gradenigi and of Gradallon, c.1550 [BSB Cod.Icon 272:361, 365]. By its definition, the staircase must be set diagonally; it is bendwise by default. See also edifices.
Estrith Rasmusdatter bears as a badge: Gules, a staircase bendwise sinister Or.