Carving details, and a vent, Qutb Minar. Also visible bell-and-chain motive, lotus motive common in Hindu temples around Arabic calligraphy, in Kufic/Thuluth script.
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/72155957@N00">Varun Shiv Kapur</a>
CC BY 2.0
originally posted to <b><a href="//commons.wikimedia.org/wiki/Flickr" class="mw-redirect" title="Flickr">Flickr</a></b> as <a rel="nofollow" class="external text" href="https://www.flickr.com/photos/72155957@N00/2898360042">Carving detail, vent</a>