“Sesame Street was brought to you today by the letter zee …” was probably the first time I was aware of a problem. Whilst I do try to contextualise my zees and zeds, sometimes the audience is just too diverse (or I am just too old). I am grateful to my French-Canadian friend and colleague Roch Bourbonnais for proposing an alternative. So “zer-eff-ess” it is, then! After all, ZFS really is zer one true filesystem, n’est-ce pas?