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Re:How North Korea’s Hackers Became Dangerously Good by BiancaDelRio on Friday April 20, 2018 @02:25PM (#16887251)
> Does ESL stand for English as a secondary language ?

I believe so.

I picked up this usage (ESL as a descriptor of person) from forums and boards around the internet. Not sure how correct it is.

Re:How North Korea’s Hackers Became Dangerously Good by haZard_OS on Friday April 20, 2018 @10:11PM (#16889642)
It is accurate and also still in use in academia. In every educational institution I have worked, "ESL" is used both verbally and in digital records.
Re:How North Korea’s Hackers Became Dangerously Good by reaperducer on Friday April 20, 2018 @06:56PM (#16888985)
It's been in use for a long time. I remember seeing it in the 70's in colleges that taught immigrants English for free in night classes.