noun The ⟨L⟩ or pipe ⟨|⟩ mark formerly used to divide integers from decimals.
noun Synonym of decimal point, which replaced such marks.
noun The proofreader's mark resembling a slash ⟨ / ⟩ or vertical bar ⟨ | ⟩ placed after a note in the margin to indicate that it should replace the item(s) struckthrough in the running text or to separate it from other margin notes.
noun A terminator: a line on a partially-illuminated surface separating the lit and shaded regions.
noun The line between regions having different magnetic fields.
noun The boundary separating two modes of behavior in a differential equation.