Flag Facts March 17th, 2017 Happy Flag Day Northern Ireland!! The “red hand” of Ulster is an Irish symbol used to denote the province. 0 Comment Brent Griebling Related posts April 25, 2018 What is a Single-Sided Custom Flag? December 19, 2012 When do I need to fly my US flag at half-staff? June 6, 2017 Happy Flag Day Sweden!