How to span a Unicode character in a page?

@leonardofmed wrote:

I’m trying to span a simple hexagon (⬢) in my page, this way:
<span>&#x2b22;</span>

but I’m receiving a rectangle with a cross in the middle, like an error icon. I tried with the decimal code (⬢), but I’m receiving the same error. If I try other Unicode character (₹), like:
<span>&#8377;</span>

it loads normally. What can be causing this symbol to be missing?

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