---
title: Advanced query expression
slug: '175'
canonical_url: https://docs.coveo.com/en/175/
collection: glossary
source_format: adoc
---
# Advanced query expression
The {doctitle} (`aq`) is a part of the combined [query](https://docs.coveo.com/en/231/) expression.
It's typically hidden to the user and generated by code based on various rules such as facet selections.