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I've seen the term "Low level Javascript" come up a few times but I've no idea what it means. Google shows no results surprisingly. Can someone shed some light on it?
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There's nothing "low level" about Javascript. It's interpreted at run-time inside an environment of high-level abstractions, like the DOM.
JavaScript is a high-level, often just-in-time compiled language that conforms to the ECMAScript standard. It has dynamic typing, prototype-based object-orientation, and first-class functions. It is multi-paradigm, supporting event-driven, functional, and imperative programming styles.
The low level functions are the functions in your program which don't call any other functions that you have written (but use the operating system or framework to compute their results etc).
These are functions that exist outside of any class, object, or interface and are defined directly inside a file. The name top-level comes from the fact that functions are not nested inside any structure and so they are at the top of the hierarchy of classes and functions.
As of 2012, someone saying "low level JavaScript" could be refering to LLJS. It's a subset of JavaScript that compiles to a JavaScript code that is garbage collector friendly but unreadable (making heavy usage of WebGL typed arrays to manage memory).
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