Quarterly national accounts are national accounts whose reference period is a quarter. They provide a comprehensive accounting framework within which economic data can be compiled and presented in a format that is designed for purposes of economic analysis, decision-taking and policymaking, on a quarterly basis.
Source
European System of Accounts (ESA 2010), Regulation (EU) No 549/2013 of the European Parliament and of the Council of 21 May 2013, Chapter 12: Quarterly National Accounts