Filofax
Concise Oxford English Dictionary © 2008 Oxford University Press:
Filofax /ˈfʌɪlə(ʊ)faks/
▶noun trademark a loose-leaf notebook for recording appointments, addresses, and notes.
– origin 1930s: representing a colloq. pronunc. of file of facts.
'Filofax' also found in these Oxford entries:

