Pretty much every icon except the red X (disagree) counts as Thanks Recieved. Most people use the Thumbs up for general thanks, the green checkmark if they agree with or want to reinforce a suggestion or statement, informative if they feel the post was especially informative, and funny if ammused.
If you want to be certain it shows up in Thanks Recieved, stick with the like or agree.
The other icons are rarely used, from what I've seen.