HTML and XML provide ways to reference Unicode characters when the characters themselves either cannot or should not be used. A numeric character reference refers to a character by its Universal Character Set/Unicode code point, and a character entity reference refers to a character by a predefined name. A numeric character reference uses the format &#nnnn; or &#xhhhh; where nnnn is the code point
![List of Unicode characters - Wikipedia](https://cdn-ak-scissors.b.st-hatena.com/image/square/f629500e6c6e001d04c9182e6c3c5b4f8ccd5d96/height=288;version=1;width=512/https%3A%2F%2Fupload.wikimedia.org%2Fwikipedia%2Fcommons%2Fthumb%2F0%2F09%2FNew_Unicode_logo.svg%2F1200px-New_Unicode_logo.svg.png)