Mysterious Marks

Many of you may have seen all kinds of cryptic signs in the margin. No, not the ones in the picture on the left :). I mean the margin icons of the code editor in Visual Studio. The most famous are breakpoint icons (Breakpoint) and bookmarks (Bookmark) . But there are others. I offer a small contest: here are 8 icons that may appear in the margins of the code editor in Visual Studio 2010 (without any plug-ins). The first one who correctly explains all of them will receive an invite from Habr from me.

Write the answers with comments to this topic, and who do not have an account on Habré - write anywhere and drop the link on Twitter with the hashtag #VsMisterySigns - I promise to read everything. Answers are conveniently numbered in accordance with the names of the variables in the code. The deadline for receiving responses is one day from the date of publication. Announcement of the winner - within 24 hours after the end of the reception of the answers, a detailed article in the same hubs.

PS Please note, №4 and №6 - this is not a glitch in the task, these are different icons indicating different things. Watch carefully. All claims - to the designers of Visual Studio.
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Upd . Twitter discussion is more active than comments. Dare, friends, everyone has a chance.
Upd2 . Bets are made, there are no more bets. The results .