Pronounced as File-loh, it was short for Filofax, it was a leather bound personal organiser with ring binders where you can add pages as refills. That was the business model. It was like the forerunner of Facebook. Functioning as a diary, everything from birthdays, contacts and business plans were recorded on it.
People were lost like zombies when they misplaced their Filo. Who are they going to call on the showy tiny flip phone that was the Ericsson T28. Who can also remember a brand called OKI?