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The difference is subtle; "${LIST[*]}" (like "$*") creates one argument, while "${LIST[@]}" (like "$@") will expand each item into separate arguments, so:

LIST=(1 2 3)
for i in "${LIST[@]}"; do
    echo "example.$i"
done

will deal with the list (print it) as multiple variables.

But:

LIST=(1 2 3)
for i in "${LIST[*]}"; do
    echo "example.$i"
done

will deal with the list as one variable.