Infinity symbol with HTML

Use the HTML entity ∞ or ∞.

You can use the following:

• literal: ∞ (if the encoding you use can encode it — UTF-8 can, for example)
• character reference: ∞ (decimal), ∞ (hexadecimal)
• entity reference: ∞

But whether it is displayed correctly does also depend on the font the text is displayed with.

∞

This does not require a HTML entity if you are using a modern encoding (such as UTF-8). And if you're not already, you probably should be.

From Wikipedia:

∞

According to List of XML and HTML character entity references:

∞

The Google search using your original question gets several useful results: How can I display an infinity symbol using HTML.

According to this page, it's ∞.

∞ ∞

Infinity is a reserved character in HTML. Following are its values in various forms.

• Hex : 8734
• Decimal : 221E
• Entity : ∞

To use in html code

<p>The html symbol is &#8734; </p>
<p>The html symbol is &#x221E; </p>
<p>The html symbol is &infin; </p>

Reference : HTML Symbols - HTML Infinity Symbol