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Besides gaining reputation with your questions and answers, you receive badges for being especially helpful. Badges appear on your profile page, flair, and your posts.

Question Badges

First bounty you manually award on another person's question
First bounty you manually award on your own question
Ask a well-received question on 5 separate days, and maintain a positive question record
153 awarded
First bounty you offer on another person's question
Question score of 10 or more
965 awarded
Question with 1,000 views
87 awarded
First bounty you offer on your own question
Ask a question and accept an answer
865 awarded
First question with score of 1 or more
1.3k awarded
Asked a question with zero score, no answers, no comments, and low views for a week
15 awarded

Answer Badges

Edit and answer 1 question (both actions within 12 hours, answer score > 0)
54 awarded
Answer score of 10 or more
1.5k awarded
Answer more than 30 days after a question was asked as first answer scoring 2 or more
83 awarded
Answer your own question with score of 3 or more
90 awarded
Answer a question with score of 1 or more
803 awarded

Participation Badges

Complete "About Me" section of user profile
19.9k awarded
Leave 10 comments
316 awarded
Earn at least 200 reputation (the daily maximum) in a single day
10 awarded
Followed the Area 51 proposal for this site before it entered the commitment phase
Post 10 messages, with 1 or more starred, in chat

Tag Badges

You must have a total score of 100 in at least 20 non-community wiki answers to achieve this badge.
73 awarded

Moderation Badges

First flagged post
233 awarded
First rollback
45 awarded
First down vote
733 awarded
Complete at least one review task. This badge is awarded once per review type
177 awarded
Delete own post with score of 3 or higher
26 awarded
First edit
727 awarded
Edit first post that was inactive for 6 months
60 awarded
First retag
115 awarded
Delete own post with score of -3 or lower
45 awarded
Approve or reject 100 suggested edits
Use 30 votes in a day
39 awarded
First up vote
4.6k awarded
First approved tag synonym
3 awarded
First tag wiki edit
26 awarded
Use the maximum 40 votes in a day
27 awarded

Other Badges

Visited every section of the FAQ (retired)
157 awarded
Share a link to a question later visited by 25 unique IP addresses
40 awarded