Final answer:
When a majority of employees sign an authorization card, it is a sign of Union certification. The process of union certification differs from country to country.
Step-by-step explanation:
When a majority of employees sign an authorization card, it is a sign of Union certification. This means that the majority of employees have expressed their desire to be represented by a union and the union has been certified as the official bargaining representative for those employees.
The process of union certification differs from country to country. In the United States, for example, a union is certified through a secret ballot election where employees vote on whether to form a union. In Canada, on the other hand, a union can be certified when a sufficient number of employees sign an official card indicating their support for the union.