 But since it was thought that 6+ would be the definition of how hard humans could climb, no climber wanted to put up this grade, leaving the entire scale very sand-bagged compared to the UIAA scale.To show that it is a Scandinavian grade, Arabic numerals are used (e.g.5, 6, 7), and for UIAA graded climbs in Scandinavia, Roman numerals are used (e.g.