Which term is commonly used to describe a voucher for entry or transportation?

The term "ticket" is commonly used to describe a voucher for entry or transportation because it specifically refers to a document or electronic medium that represents a right to enter an event, venue, or to travel on a form of transportation such as a bus, train, or airplane. Tickets typically include information about the event or service, such as the date, time, location, and seat number, where applicable.

In contrast, while the other terms may be related to entry or transportation in some contexts, they do not fit the definition as precisely. A "card" often refers to a plastic or paper item used for various purposes, like identification or credit, rather than specifically for entry or transportation. A "pass" generally signifies a document granting access to a specific area but may not necessarily be tied to a ticketed event or travel. A "coupon," on the other hand, is usually associated with discounts or promotions rather than serving as a means of entry or passage itself. Thus, "ticket" is the most appropriate and widely recognized term to describe a voucher for entry or transportation.