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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
5 awarded
First bounty you offer on another person's question
Question score of 10 or more
27 awarded
Question with 1,000 views
First bounty you offer on your own question
Ask a question and accept an answer
39 awarded
First question with score of 1 or more
98 awarded

Answer Badges

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

Participation Badges

Complete "About Me" section of user profile
1.4k awarded
Visit an election during any phase of an active election and have enough reputation to cast a vote
Leave 10 comments
15 awarded
Earn at least 200 reputation (the daily maximum) in a single day
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.
2 awarded

Moderation Badges

First flagged post
8 awarded
First rollback
First down vote
36 awarded
Complete at least one review task. This badge is awarded once per review type
2 awarded
Delete own post with score of 3 or higher
First edit
44 awarded
Edit first post that was inactive for 6 months
First retag
8 awarded
Delete own post with score of -3 or lower
Approve or reject 100 suggested edits
Use 30 votes in a day
First up vote
350 awarded
First approved tag synonym
First tag wiki edit
1 awarded
Use the maximum 40 votes in a day

Other Badges

Share a link to a post later visited by 25 unique IP addresses
3 awarded

Retired Badges

Visited every section of the FAQ
Asked a question with zero score, no answers, no comments, and low views for a week
3 awarded