The <cscm:not-recognized> tag is part of the multichannel framework that lets you build portals for mobile devices.
This tag renders its content if the client has not been mapped to any classification (defined in <project>\WEB-INF\client-classifications.xml).
<tagName>
</tagName>
none
<cscm:not-recognized>
<img src="images/big_logo.gif">
</cscm:not-recognized>