MDL2 Icons
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mdl2-set-lock-screen · Unicode: \ue7b5 · Categories: AppBar glyphs

After you get up and running, you can place MDL2 icons just about anywhere with the <i> tag:

Example of set-lock-screen mdl2-set-lock-screen 
<i class="mdl2 mdl2-set-lock-screen" aria-hidden="true"></i>

Note: to improve web accessibility, we recommend using aria-hidden="true" to hide icons used purely for decoration.