What is the term used for nicknames entered in a system using an alias format?

The term used for nicknames entered in a system using an alias format is "Aliases." This is the correct choice because, in many law enforcement and data systems, aliases are utilized to represent the various names or nicknames individuals might use. These aliases are essential for accurate identification and tracking of individuals, especially when they may not be using their legal names.

Aliases allow law enforcement to capture and present different identities associated with a person, which is crucial during investigations or when searching databases for criminal records. By incorporating these different identifiers, agencies can ensure a more comprehensive understanding of an individual's background and associations.

The other terms listed, such as Alternate Name, Display Name, and Nick Identification, do not specifically refer to the format of nicknames used in the alias context within law enforcement systems. While all may relate to names, "Aliases" most precisely captures the essence of what is described in this context.