To expand on the other answer, normal images cannot be directly imbedded anymore, that was only allowed for like a few days when we went live. This is one of the chapo emotes [from discord I think], which the devs did something to transfer them over. Their name goes in between a pair of :'s and you can see the full list here https://cadence.moe/misc/chapo-chat-emojis :virgil-bb: