Thrackle is a term used to describe a specific type of drawing in graph theory, where points (or vertices) are connected by edges (or lines) in such a way that no two edges cross each other, and every pair of edges intersects at most once. In a thrackle, edges that meet can do so only at their endpoints. The concept of thrackles is of interest in mathematics and theoretical computer science, particularly in the study of planar graphs and combinatorial geometry.
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