How does the symbol of Bluetooth correspond to H and G of Harold Bluetooth Gromson, its inventor?

Bluetooth® is named for Tenth Century Danish king Harald Blåtand, known in English as Harold Bluetooth Gromson, who is reputed to have been so fond of blueberries that his teeth were stained blue. The Bluetooth symbol is a bindrune that combines the runes for Harald Blåtand’s initials. So how can the symbol of Bluetooth be broken down to H & G?