How can we write Koppa in Unicode?

In HTML, you can represent the Greek Koppa (Ϙ) character using its Unicode code point, which is U+03D9. Here's an example of how to use it in an HTML document:

<p>The Greek Koppa (Ϙ) can be represented in HTML as: &#x03D9;</p>

The "&#x" syntax is called a character entity reference, and it allows you to represent special characters in HTML using their Unicode code points. The code point for the Koppa is expressed in hexadecimal (base 16) as "03D9".

You can also use the named character entity reference for the Koppa, which is "&Koppa;", but not all browsers support this entity.

<p>The Greek Koppa (Ϙ) can be represented in HTML as: &Koppa;</p>