LessWrong has its own palette of clickable reacts to text! They are quite different from those on other websites.

Here are all the ones currently active on LessWrong.

Name	Description	Explanation
Agreed		LessWrong allows you to agree-upvote, but then people couldn't know who agreed. When agreeing with a reply to your comment, this reaction allows people to know you specifically agree
Disagree
Important
Good point!	This comment makes a good point
That's a crux	My other beliefs would be different if I had different beliefs about this
Not a crux	My other beliefs would not change if I had different beliefs about this
Strong Argument	This is a strong, well-reasoned argument.
Weak Argument	This argument is weak or poorly reasoned.
Changed My Mind	I updated my beliefs based on this.	In math, Δ ('delta') means 'change'
Changed My Mind (on this point)	I've changed my mind on this particular point (not necessarily on any larger claims).
Scout Mindset	Good job focusing on figuring out what's true, rather than fighting for a side	Scout mindset is "the motivation to see things as they are, not as you wish they were". From the book The Scout Mindset by Julia Galef
Soldier Mindset	This seems to be trying to fight for a side rather than figure out what's true	Opposite of Scout Mindset
I notice I'm confused	I don't have a clear explanation of what's going on here
I don't understand
Smells like LLM	This reads to me like it could've been written by a language model.
Clearly Written	I had an easy time understanding this
Difficult to Parse	I had trouble reading this.
Missed the point	I think this misses what I (or the other person) actually believes and was trying to say or explain
Misunderstands position?	This seems to misunderstand the thing that it argues against
Seems Offtopic?	I don't see how this is relevant to what's being discussed.
Too Sneering?	This is too much sneering (signaling disrespect and derision) relative to its substantive critique.
Too Combative?	This seems more combative than it needs to be to communicate its point.
Concrete	This makes things more concrete by bringing in specifics or examples.
Examples?	I'd be interested in seeing concrete examples of this
Already addressed	This has been covered earlier in the post or comment thread.
Bowing Out	I'm bowing out of this thread at this point. Goodbye for now!
Paperclip		See the Squiggle Maximizer (formerly "Paperclip maximizer") tag.
Hits the Mark	This hits the mark
Why? / Citation?	Why do you believe that? Or, what's your source for that?
Nice Scholarship!	Good job looking into existing literature and citing sources
Let's make a bet!	I'm willing to put money on this claim!	Why is betting important?
Good Facilitation	This seemed to help people understand each other
Question Answered	This resolved my question! Thanks.
Plus One		Akin to saying "me too"
I Saw This	...and thought it'd be useful to let people know.
Less than 1% likely	I put 1% or less likelihood on this claim
10% likely	I put about 10% likelihood on this claim
~25% likely	I put about 25% likelihood on this claim
~40% likely	I put about 40% likelihood on this claim
~50% likely	I put about 50% likelihood on this claim
~60% likely	I put about 60% likelihood on this claim
~75% likely	I put about 75% likelihood on this claim
~90% likely	I put about 90% likelihood on this claim
99+% likely	I put 99% (or more) likelihood on this claim
Unsure	I don't know what to think of this
Thinking	Food for thought
Exciting	This is exciting!
Beautiful!
Haha!
Oops!	Oops! I made a mistake or error.
Disappointed
Sad
Smile	This makes me happy. :)
Heart
Typo	This contains a typo, or minor editing error
Nitpick	This seems like it's focusing on a relatively unimportant point.
Moloch	Moloch whose mind is pure machinery! Moloch whose blood is running money! Moloch whose fingers are ten armies! Moloch whose breast is a cannibal dynamo! Moloch whose ear is a smoking tomb!	A reference to Scott Alexander's classic essay Meditatons on Moloch, in which the evil god 'Moloch' is made the face of all human coordination problems and the suffering and strife that they lead to. In a problem where no actor is ultimately responsible, we figuratively name Moloch responsible, to have an enemy to fight. This react is appropriate when someone is regrettably fighting a faceless bureaucracy, or a culture, or something much larger than a single human, that no human fully determines or controls. See the Moloch tag
"I beseech you!"	"I beseech you, in the bowels of Christ, think it possible you may be mistaken" —Oliver Cromwell, 1650	See Cromwell's rule
Agree Denotationally, Disagree Connotationally	I agree with the explicit meaning of these words, but I don't agree with what I read as the subtext here.	Coined by this comment
Thanks
Thumbs Up	I saw this, and feel vaguely good about it
Thumbs Down	I saw this, and vaguely dislike it
Surprise	I did not expect that!