"Share" is a nearly universal concept in the apps we use daily on our phones and tablets: here's a thing I want to put in an email, a text message, a status update, or a tweet. Yet, as designer Min Ming Lo points out, the icons used to indicate that concept are strange and completely different depending on the platform you're using. iOS uses something that looks a bit like you're uploading a file; Android uses three interconnected dots; Windows uses a circle; others use a graph or even a wrapped gift.
Which one's best? That may be a matter of personal taste, but the Pixelapse co-founder has some ideas. Head over to the company's blog to see his argument.