Knot related: Patrick Novotny[1] has a youtube channel with 100+ ways to tie your tie. A fun intersection between knot enthusiasm and attractive attire.
The reef knot (square knot) with both ends slipped is called a bow knot (shoelace knot).
https://en.wikipedia.org/wiki/Reef_knot https://en.wikipedia.org/wiki/Shoelace_knot
If you click through to the page about the “standard shoelace knot” it adds: “This knot appears in The Ashley Book of Knots as #1212 and #1214, ‘The Bowknot’, where it is described as ‘... the universal means of fastening shoe-strings together.’” (That’s a reference book from the 1940s https://en.wikipedia.org/wiki/The_Ashley_Book_of_Knots)
Edit: note that this is a site aimed at an audience of people who want to tie their shoes, not topologists or sailors. Pedantic arguments about acceptable definitions of the word “knot” are ridiculous in this context.
There are only The 85 Ways to Tie a Tie.
https://en.wikipedia.org/wiki/The_85_Ways_to_Tie_a_Tie?wprov...
"Though he had almost no formal training in pure mathematics, he made substantial contributions to mathematical analysis, number theory, infinite series, and continued fractions, including solutions to mathematical problems considered to be unsolvable. Ramanujan initially developed his own mathematical research in isolation; it was quickly recognized by Indian mathematicians."