title: Write Check Marks in RMarkdown?
body: <p>I try some examples from LaTeX, such as <code>\Checkedbox</code>, <code>\CrossedBox*</code>, <code>\HollowBox</code>, but unfortunately, they all do not work. I found <code>$\Box$</code>, <code>$\checkmark$</code>. Anyone know how to type checked box?</p>