The phrase "official designation" refers to a title or name that is formally given to someone or something to represent their role or status in a particular organization or system. Full definition
For the W221 (Mercedes» official designation for the 2006 - 2013 S - class) the Stuttgart limo company had a point to prove. (carmagazine.co.uk)
UC San Diego Health is awarded official designation as a Cardiac Center by the California State Department of Public Health to provide highly specialized care for children with heart disease. (health.ucsd.edu)
«Plan B» involved exploiting a loophole in the Political Parties, Elections and Referendums Act which states that the Electoral Commission can only give official designation to a «lead» campaign group on one side if there's a credible campaign on the other side to officially designate. (conservativehome.blogs.com)