EO Eleven. English changes drastically over time. All right, the question is how a process speedy goes? So, sometimes I wonder if contemporary English speaking folks know the terms which were used a few decades ago? For instance, can somebody nowadays explain plainly what does it mean ' eo eleven ' ? The term, I presume, was used a lot in the past sixties or so. For myself I got a vague idea of its meaning. Thanks a lot.