Topological

At first, Tom's idea for a topological map of Switzerland made of cast iron for his bedroom floor sounded good, but it proved impossible to vacuum -- especially when it collapsed into the next floor.

Source: tatoeba (6916608)

2013, Johnston, Adrian, "Jacques Lacan", The Stanford Encyclopedia of Philosophy (Summer 2013 Edition), Edward N. Zalta (ed.) Jacques Lacan in Stanford Encyclopedia of Philosophy By the 1970s, with his meditations on the topological figure of the Borromean knot—this knotting of three rings, pictured on the coat of arms of the Borromeo family, is arranged such that if one ring is broken, all three are set free in disconnection—Lacan emphasizes the mutual dependence of the registers on one another. Hence, loosely speaking, the Imaginary, the Symbolic, and the Real can be thought of as the three fundamental dimensions of psychical subjectivity à la Lacan.

Source: wiktionary

topological group

Source: wiktionary