Final answer:
An entity type name should always be a singular noun when designing a database or software system.
Step-by-step explanation:
The statement of the question is true. An entity type name should indeed always be a singular noun. When designing a database or software system, we use entity type names to represent different types of objects or concepts. For example, if we have a database for a library system, we might have an entity type called "Book". This name is a singular noun because it represents a single book object.