---
title: "Z"
subtitle: "Constant in std"
excerpt: "The 3D Z-axis."
layout: manual
---

The 3D Z-axis.

```kcl
Z: Axis3d
```



### Type

[`Axis3d`](/docs/kcl-std/types/std-types-Axis3d) - An abstract and infinite line in 3d space.