Thanks for the reply, I looked at the reference links that you had suggested.
Per Ivan Zhekov, in his post in Font Icons are not loaded in IE11 he mentioned that
"Just to be on the same page, Untrusted font blocking policy differs from Allow font download policy. The former disabled use of fonts not located within windir/fonts directory (for any Microsoft app), while the latter simply doesn't download any fonts (in Internet Explorer and Edge)."
"Allow font download policy" in the internet explorer -The internet explorer settings are controlled by the admin and allow font download for IE 11 is set to disabled due to security reasons.
So my question is there any other possible solutions to display embedded icons in IE browser for telerik Ajax controls.