# ParameterGroup

> Grouping used to organize the vocabulary (display only).

> **ParameterGroup** = `"physical"` \| `"aggregate"` \| `"major_ion"` \| `"nutrient"` \| `"organic"` \| `"disinfection"` \| `"mining_redox"` \| `"metal"` \| `"microbiology"` \| `"radioactivity"`

Grouping used to organize the vocabulary (display only).