Crossed Fingers emoji is the hand gesture, which is commonly used when wishing good luck. And this emoji is used exactly in the same meanings its base gesture is used in real life – for example, it may follow up the requests to wish the user good luck or their own wishes of good luck to someone else; often, it is used together with friendly-looking smileys like 😉 Winking Face emoji. Its other meaning is connected to lying – in real life, children hide it behind their backs when promising something they are not going to do; online, it is quite rare in this meaning.
Examples of using
“Wish me good luck at tomorrow’s exam, please 🤞”
“I told mom that I won’t skip school 🤞”