XP
Other notable XP boosts include:
How do I get XP from answering questions?
When you reply with an answer to the question, and the author accepts your solution, you will gain the number of XP points listed for that question. Questions can only have one accepted solution, but individual replies can still receive XP.
Why are the numbers on some posts higher than others?
Click the XP button on the message. If you change your mind about the quality of the message, you can remove your XP.
The XP button will have changed to Remove XP. Click it to remove your XP. The XP count is updated and the XP badge shows that you can now give the message XP again
How can I see who else gave XP to a message?
Why can't I give XP to some messages?