separatrix
Noun

separatrix (plural separatrixes or separatrices)

  1. (typography, historical) The ⟨L⟩ or pipe|mark formerly used to divide integers from decimals.
    Synonyms: pipe, slash
  2. (typography, obsolete) Synonym of decimal point#English|decimal point, which replaced such marks.
  3. (typography) The proofreader's mark resembling a slash ⟨ / ⟩ or vertical bar nowrap ⟨ ''' 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.
  4. A terminator: a line on a partially-illuminated surface separating the lit and shaded regions.
  5. (physics) The line between regions having different magnetic fields.
  6. (mathematics) The boundary separating two modes of behavior in a differential equation.



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