Self-reference in logic is named after the ancient symbol Ouroboros, a dragon that continually consumes itself, denotes self-reference [0]. I found out about this when reading about Russell's paradox [1]. The turn of the 19th century was an extraordinary time where logicians, mathematicians and philosophers "discovered" revolutionary ideas that we are still today trying to understand and find proofs [2].

[0] https://en.wikipedia.org/wiki/Self-reference#In_logic,_mathe...

[1] https://en.wikipedia.org/wiki/Russell%27s_paradox

[2] https://en.wikipedia.org/wiki/History_of_mathematics#19th_ce...