special issue
adj1
Not of the usual type issued by an organization.
- The special forces in the area had some special issue weaponry in addition to the standard rifle and service pistol.
special issue
noun1
Law An issue taken by denying a particular part of the allegations.
2
An issue that is different from the usual run of issues, usually because it is a theme issue: one in which the articles are unified by a theme. Some supplements are of this character, and whether such an issue is called a supplement or a special issue is determined by each journal's style.
Scientific journals