It definitely depends on your audience but the general non-tech audience probably doesn't know what "FAQ" stands for on average. In fact, most of the things you tech for granted among a tech-savvy audience disappear if you are targeting an audience that includes a non-trivial non-tech segment.
Source: Working at a startup with a wide audience. The email consisting only of the subject line "WHAT IS PASSWORD" was not the least-savvy email received.