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** Definition:**

A **knot** is a simple closed curve in 3-dimensional space.

**What does that mean?** Well, a loop like the one at the left is considered a knot in mathematical knot theory (it is a simple closed curve in 3-dimensional space). In fact this knot has a special name: The unknot. The ** unknot** can be drawn with no crossings, and is also called a ** trivial** knot. It is the simplest of all knots.

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**The Borromean knot**

So called because the figure is found on the coat of arms of the Borromeo family, the Borromean Knot is a group of three rings which are linked in such a way that if any one of them is cut, all three become separated. In his late seminars, i.e., from Seminar XX onwards, Lacan uses the Borromean knot as a way of illustrating the interdependence of the three orders of **the real**, **the symbolic** and the **imaginary**. This corresponds to a rethinking of the relationship between **language** and the **body** in the structuring of the subject.