Final answer:
Couples indicate they are married by using specific terms like 'husband' and 'wife' to refer to each other and by participating in marriage ceremonies.
Step-by-step explanation:
In many cultures, couples indicate that they are married through various means. One common way is by using specific terms to refer to each other, such as 'husband' and 'wife.' These terms have significant meaning and are globally recognized. For example, the quote provided by Paul Katami and Jeff Zarrillo highlights their excitement to use the term 'husband' and how it signifies a deeper love and commitment. Another way couples indicate they are married is through marriage ceremonies, where they publicly declare their commitment and exchange vows. These ceremonies can vary in different cultures and can involve rituals like the exchange of rings or other symbolic items.