# Nodes

Every built-in node, by pack. A node's inputs and outputs are its sockets, and a
socket's type includes the unit it carries. The install line on each pack's page
is the smallest [installation tier](../../installation.md) that has it.

```{toctree}
:maxdepth: 1

nodes-checks
nodes-core
nodes-engineering
nodes-geo
nodes-maths
nodes-report
nodes-requirements
nodes-science
nodes-symbolic
nodes-uncertainty
nodes-units
```