JKR's website

[Maria Vaerewijck]

No: HPFGUIDX 149501


Ceridwen <ceridwennight at hotmail.com> wrote:
  
I'm still waiting on Peeves, but did anyone else find that book that 
explains the symbolisms for numbers?  Demiguise for zero, salamander 
for six (the maximum amount of hours it can survive outside of 
flame), and seven, the Unknown - the symbolic number of seven has yet 
to be discovered?



maria8162001 here:
   
  The book you're looking for is "The Ancient Runes Made Easy" it's next to the "Book Of Spell." You have to click on The Ancient Runes book once and it will fall out/open. 
   
  SPOILER SPOILER SPOILER:
  The numbers you're looking for is JKR's birthdate. Sorry can't help it.