A more thorough explanation:

Definition: Firma social (feer-mah soh-syahl) is a term used in Spanish law to refer to the officially registered name of a corporation or partnership.

Example: If a group of individuals in Spain decide to start a business together, they must register their company with the government and choose a firma social, or official name, for their business. For example, a group of friends starting a restaurant together might choose the firma social "La Mesa Feliz" (The Happy Table).

Explanation: The example illustrates how a group of individuals starting a business in Spain would need to choose a firma social, or official name, for their company in order to register it with the government. The chosen name would then be used on all official documents and in all business transactions.