# Rougail > **🛈 Informations** > > **rougail**\ > `standard` | Variable                                                    | Description                                                 | |------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | **rougail.var**
`string` `multiple` `standard` `mandatory` `unique` | A variable.
**Default**:
• a | # Extra > **🛈 Informations** > > **extra**\ > `basic` ## dyn_*a* > **🛈 Informations** > > **extra.dyn_*a***\ > This family builds families dynamically.\ > `basic`\ > **Identifiers**: the value of the variable "[A variable](#rougail.var)" | Variable                                                                                                | Description                                                                                             | |------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | **extra.dyn_*a*.var**
`string` `basic` `mandatory` | |