# Rougail > **🛈 Informations** > > **rougail**\ > `standard` | Variable                                                                                                                       | Description                                                                                                                    | |------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | **rougail.var**
[`string`](https://rougail.readthedocs.io/en/latest/variable.html#variables-types) `standard` `mandatory` `unique` `multiple` | 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`](https://rougail.readthedocs.io/en/latest/variable.html#variables-types) `basic` `mandatory` | |