The current choice for cool girls - also knows as the squareletto - you do not mess with someone sporting a coffin nail. Otherwise known as the daintier sounding 'ballerina', the long (always) shape tapers off to a square tip.
Because it takes so long to achieve, says Miss Pop, (it requires the stability of gel or acrylic, you have to taper, square off, and round the file), 'this is the marked shape of a person who does not skimp on their time to primp.'