Only use the kissy-cat emoji when you really, really mean it. You can also use it to indicate that you are (or your cat is) blowing something out your mouth.

The ninja cat emoji are exclusive to Windows 10 and use zero width joiner sequences, which are basically hacks to support non-standard Unicode emoji. If you’re not familiar with the finer points ...

Well, cat emoji at least. As CNET first pointed out, it turns out you can quickly customize your Mac desktop folders with emoji of your choice.