I almost can't believe that all of the other (current) comments are complaining about the use of the λ character. Unicode is hardly a new concept, and it is certainly not "hostile" (hyperbole much?).
In fact, as modern languages like Julia become popular, I think we will see increased use of unicode characters in coding. Julia is very unicode friendly, which aids scientists and mathematicians when translating formulas to code. For example, it supports the "element of" operator ('∈') for testing if an item is in a set. These unicode characters actually _improve_ readability in many contexts, while being less convenient to type if you're only accustomed to ASCII.