<!-- You may place favicon.ico and apple-touch-icon.png in the root of your domain and simply remove these references -->
<link rel="shortcut icon" href="/favicon.ico">
<link rel="apple-touch-icon" href="/apple-touch-icon.png">

http://www.apphp.com/index.php?snippet=html-favicon-and-apple-icons

The favicon is much normality in our days. Here the "apple-touch-icon" definition which is used when you save a bookmark to your home screen on an apple touch devices such as an iPad or iPhone. The interesting thing is that Android also supports its usage. The standard size for "apple-touch-icon" size is 60px by 60px.

Favicon and Apple Icons in HTML

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