Why is the title of Sherlock Season 3 Episode 2 called Three Signatures?

1. The symbol of tribute four, a story in the original work.

This episode revolves around the wedding of Watson and Mary. Literally, the "three signatures" correspond to Watson, Mary and Sherlock.

3. The original title "Three Signs" can be translated into "Three Signs", "Three Signs" and "Three Signs", suggesting that Shylock infers that Mary is pregnant at the end of the film.

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