A Microsoft file hosting and synchronization service.
Hello,
Going in order from left to right:
The checkmark means the item is selected.
The webpage with a globe in the middle of it signifies that the item that's selected has something to do with a webpage or a shortcut (probably has a file extension of .htm, .html, or .lnk).
The three lines on the top left corner of the word means that the item is new or was just uploaded to OneDrive.
Hope this helps.