אחד-עשר - הגיל שבו גילה הארי פוטר
שהוא קוסם!
"Monday. This reminded Harry of something. If it was Monday — and you could usually count on Dudley to know the days of the week, because of television — then tomorrow, Tuesday, was Harry’s eleventh birthday. Of course, his birthdays were never exactly fun — last year, the Dursleys had given him a coat hanger and a pair of Uncle Vernon’s old socks. Still, you weren’t eleven every day."
וגם - 11 שנות חגיגות על היעלמותו הזמנית של וולדרמורט, לאחר שהקללה שלו פגעה בהארי:
“You can’t blame them,” said Dumbledore gently. “We’ve had precious little to celebrate for eleven years.” “I know that,” said Professor McGonagall irritably. “But that’s no reason to lose our heads.
“My dear Professor, surely a sensible person like yourself can call him by his name? All this ‘You-Know-Who’ nonsense — for eleven years I have been trying to persuade people to call him by his proper name: Voldemort.” Professor McGonagall flinched, but Dumbledore, who was unsticking two lemon drops, seemed not to notice.