Today Google announced that it will start indexing SVG files.

What is a SVG file?

Below is definition is provided by Wikipedia

Scalable Vector Graphics (SVG) is a family of specifications of an XML-based file format for describing two-dimensional vector graphics, both static and dynamic (i.e. interactive or animated).
The SVG specification is an open standard that has been under development by the World Wide Web Consortium (W3C) since 1999.[4]

UP to this point Google either didn’t index them or only index them when it thought it was needed. But now it seems that they are indexed all SVG files regardless of if it is necessary or not. If you don’t want your SVG files to be index, you can use robots.txt and meta tags in the page with nofollow, noindex. (Learn how)

Google has advised webmasters to be patient as indexed all SVG files may take some time since web is so huge.