Dog-leg stair: parallel flights rising alternately in opposite directions, without an open well. Flying stair: cantilevered from the walls of a stairwell, without newels; sometimes called a Geometric stair when the inner edge describes a curve.
Structurally the flights of a dog-leg stair are usually supported by the half-landing, which spans the adjoining flank walls.
From the design point of view the main advantages of a dog-leg stair are: ...
Of a porch or portico: having two columns.Dog-leg stair
With parallel flights rising alternately in opposite directions, without an open well.Dogtooth ...
 See also: Dog-leg, Band, Ornament, Porch, Lectern
  
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