Valid JavaScript variable names in ES5 · Mathias BynensNote: This article is based on the ECMAScript 5 specification. For the updated ES2015 version, see Valid JavaScript variable names in ES2015. Did you know var π = Math.PI; is syntactically valid JavaScript? I thought this was pretty cool, so I decided to look into which Unicode glyphs are allowed in JavaScript variable names, or identifiers as the ECMAScript specification calls them. Reserved word
