fiddler
Icon that resembles "< >" in Fiddler
Referring to the Fiddler's User Interface guide: http://docs.telerik.com/fiddler/knowledgebase/uiguide
It seems deprecated, since it still uses the old-style logos despite the redesign.
What does the < > icon stand for?
The closest alternative from the old logos are XML.
Solution
Sadly, the website's icons haven't been updated. < > refers to HTML.
Here's a screenshot of all of the icons from the Fiddler book:
