Separatrix (from Latin, the feminine form of "separator") may refer to:
- Separatrix (decimal mark), an ⟨L⟩ mark or vertical bar ⟨|⟩ formerly used as a decimal point
- Separatrix, a proofreader's mark resembling the slash ⟨/⟩
- Separatrix in math, an equation to determine the borders of a system
- A mechanism for magnetically limiting a plasma, and hence for controlling the nuclear fusion in a tokamak; see divertor
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