$$ is an internal variable, it stores the process ID of the script itself or the current bash instance.

Here is an example use case

```
echo $$

The output prompted.

```
darryl@Darryl-PC$ echo $$
8
```
```
      
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Rust is a recent programming language focused on performance and memory safety, mainly safe concurrency.

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Deno v1.1.1 is out, it is a secure runtime for JavaScript and TypeScript.

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[Windows](/tag/wordpress/) is known for auto restarting after downloading and installing updates, it mostly restarts when you have something important running on your laptop. [(more…)](https://darryldias.me/2020/stop-windows-10-from-auto-re...

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There are many advantages to work with isolated objects, isolating an object or part of a mesh, it lets you focus specifically on a certain area of the scene, this helps to analyze the scene better, it is also lighter for the viewport to compute while working on a big or heavy Blender scene file.

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