square or half-hitch?

knots [click to embiggen]

Aww, poor Buggs!

Transcript:

Mr and Mrs Bugg, now looking quite sad indeed, are still joined at the antennae, but now those antennae are knotted together most painfully. They each have an arm raised, signalling for help.

The text reads: “OOOOPS! The buggs are now knotted.”