title: How to control the orientation of the angular mat-icon
body: <p>Angular version: v9</p>
  
  <p>I have a button whose mat-icon is an arrow pointing towards the left.  I would like to know if there is any attribute for the mat-icon element tag to allow me to control the orientation of the arrow so that it points upward instead.</p>
  
  <p>For the sake of learning purpose, instead of looking for another icon which achieves what I want, I prefer to learn how to do it via attribute in angular.</p>
  
  <p>I search online, but could not find a solution. Hence this question. Help appreciated. Thanks</p>