Here's how to pronounce it:
1. Open your mouth slightly.
2. Raise the back of your tongue towards the back of your throat, but don't touch.
3. Force air out through the narrow gap you've created.
It's similar to the "h" in "hat" but made further back in the throat, almost as if you're clearing your throat.
Here are some examples:
* Arabic: The letter "ħ" (ح) is pronounced this way.
* Maltese: The letter "ħ" is also pronounced this way.
It's a difficult sound for many English speakers to produce, so practice it slowly and carefully!