Copyleft symbol

As smnbbrv said in his answer, it is unavailable. However, with some styling you can achieve the desired result:

span {
  font: 18px Arial, sans-serif;
  display: inline-block;
  transform: rotate(180deg);
}

<span>&copy;</span>

You have an html tag in your post, so I assume it's for webbased ends. This might be something you can use.

What about some CSS ?

.copyleft {
  display:inline-block;
  transform: rotate(180deg);
}

<span class="copyleft">&copy;</span>

It was just added as part of Unicode 11.0.

Code point: U+1F12F ð¯ COPYLEFT SYMBOL

html entity: 🄯 or 🄯

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