# A dynamic family > **🛈 Informations** > > **dyn*a***\ > **dyn*b***\ > This family builds families dynamically.\ > `standard`\ > **Identifiers**: > - a > - b | Variable                                                                                                   | Description                                                                                                | |------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | **dyn*a*.var**
**dyn*b*.var**
[`string`](https://rougail.readthedocs.io/en/latest/variable.html#variables-types) `standard` `mandatory` | A variable inside dynamic family.
**Default**: val |