Why is she calling me "hun"?

So this is the same girl from the previous situation, it's a bit odd but I wanted to address this out of curiousity. We talk a good bit but have not met each other face to face yet and every now and then she'll call me "hun". what does this mean? I find it a bit odd.
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+1 y
Hmm, alright. I was just curious lol.
Why is she calling me "hun"?
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