How did Voldemort/his Death Eaters taboo the name 'Voldemort?'

From the text:

“NO!” roared Ron, causing Harry to jump into the hedge and Hermione (nose buried in a book at the tent entrance) to scowl over at them. “Sorry,” said Ron, wrenching Harry back out of the brambles, “but the name’s been jinxed, Harry, that’s how they track people! Using his name breaks protective enchantments, it causes some kind of magical disturbance — it’s how they found us in Tottenham Court Road!”