It depends how you answer the question. 1. Has there been an emoji defined in the Unicode standard, that represents a seahorse? No 2. Has there been an emoji

It depends how you answer the question. 1. Has there been an emoji defined in the Unicode standard, that represents a seahorse? No 2. Has there been an emoji defined in the Unicode standard, that was represented by a specific operator as a seahorse? Maybe? 3. Has there been an emoji added by a mainstream operator (i.e. Slack), that was represented by a specific operator as a seahorse? Maybe? 4. Has there been an emoji added by a community, that was represented by a specific operator as a seahorse? Definitely. We can be definitive about 1 based on the actual standard and standardisation work. Emojipedia allows us to be fairly confident about 2 being No. 3 is much harder. And 4 is definitely yes. The existence of 4 and maybe 3 pollutes the training data for LLMs and humans alike. (The fact that it was proposed makes it possible it was added and then replaced by an operator)