A more thorough explanation:

et alius

Et alius is a Latin phrase that means "and another."

• The book was written by John Smith et alius.
• The team was made up of Sarah, Tom, and et alius.

These examples show how et alius is used to refer to additional people or things that are not specifically named. In the first example, the book was written by John Smith and other authors who are not mentioned. In the second example, the team was made up of Sarah, Tom, and other members who are not named.