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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
89 awarded
First bounty you offer on another person's question
Question score of 10 or more
545 awarded
Question with 1,000 views
70 awarded
First bounty you offer on your own question
Ask a question and accept an answer
539 awarded
First question with score of 1 or more
989 awarded
Asked a question with zero score, no answers, no comments, and low views for a week
9 awarded

Answer Badges

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

Participation Badges

Complete "About Me" section of user profile
10.5k awarded
Leave 10 comments
344 awarded
Earn at least 200 reputation (the daily maximum) in a single day
9 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.
47 awarded

Moderation Badges

First flagged post
177 awarded
First rollback
41 awarded
First down vote
742 awarded
Complete at least one review task. This badge is awarded once per review type
129 awarded
Delete own post with score of 3 or higher
24 awarded
First edit
612 awarded
Edit first post that was inactive for 6 months
55 awarded
First retag
92 awarded
Delete own post with score of -3 or lower
30 awarded
Approve or reject 100 suggested edits
Use 30 votes in a day
35 awarded
First up vote
3.2k awarded
First approved tag synonym
First tag wiki edit
21 awarded
Use the maximum 40 votes in a day
16 awarded

Other Badges

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