This might initially seem like the sort of question that is easy to Google, but it's not.  Instead of useful results, you get things like answers to the question What does Ubuntu mean?, or what does ~ mean in a Linux shell? or mean, median, mode, and range.  Every different attempt I've made fails because of the normal meaning of mean and how Google interprets that.The context in which I've encountered this is my Digital Ocean control panel:
What is MEAN (on Ubuntu)?
linux;application;terminology
There is the explanation by digital ocean (since i think that's where you got the screenshot from):what is mean on ubuntuIt's an application stack based on NodeJS and MongoDB. You can read more about it here: http://mean.io/.MEAN is a boilerplate for applications using MongoDB, Express, AngularJS and Node.js.Oh, and btw I've googled that by using . Like this: googling mean on ubuntu