title: What is the meaning of plus in SASS
body: <p>I am reading the code of <a href="https://github.com/jgthms/bulma/blob/master/sass/grid/columns.sass" rel="noreferrer">bulma</a> and I am having trouble to understand the mening of "+" in front of a variable in SCSS</p>
  
  <p>This is a code snippet using the "+" sign:</p>
  
  <pre><code>  +mobile
      &amp;.is-narrow-mobile
        flex: none
      &amp;.is-full-mobile
  </code></pre>
  
  <p>So what is it?</p>