# Glossary

## Terms

**Financial Value**: The core data type representing a financial amount with units and metadata.

**Policy**: Configuration that controls how calculations behave, especially error handling.

**Policy Context**: A scope where specific policies are active.

**Registry**: A collection of related calculations and types.

**Unit**: A dimensional quantity (currency, percentage, etc.) attached to values.

**Null Behaviour**: How the system handles missing or undefined values.

**Engine**: The calculation execution system that processes financial operations.