etymology - Why does the phrase cross my fingers' mean just

Originally, I thought "cross my fingers' would mean something like this picture shows: But by a search for the phrase "cross my fingers images" on the web, I get most of pictures like this: So, I

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Crossing the Finger (Crossed Fingers) - A good luck sign with Early Christian origin and deep symbology - ☩ Walking in Light with Christ - Faith, Computing, Diary

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Fingers Crossed What Does This Popular Idiom Mean? • 7ESL