The Siretisation rate refers to the percentage of businesses or individuals in a given area that have registered for a SIRET number. This unique 14-digit identification number is assigned to all businesses in France and is used for tax and administrative purposes. A high Siretisation rate indicates a thriving business environment, as it reflects a large number of registered and active businesses. This term is commonly used in economic studies and analyses to measure the level of entrepreneurship and economic activity in a particular region. A low Siretisation rate may suggest a lack of business development and potential for growth.