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Close to the ending of Koe no Katachi, Nishimiya Shouko did a motion with one of her hands below the other and her pinkies intertwined. What does this mean?
Before the sign in your picture, which stands for promise (約束) also known as 'pinky promise', Shouko puts two hands together. Which stands for friends (友達).
Which would come down to: "friends promise"
And can be inteprated as "Promise to be friends forever"