By chaining the selectors together, he was able to encode invisible messages inside an emoji (or any other Unicode character) ...

Discover how hidden Unicode data, including emojis, is being used to exploit AI systems and what developers can do to ...

Paul Butler tests and demonstrates the flexibility of encoding hidden messages within Unicode characters, including emoji.

Using variation selectors, you can conceal messages of arbitrary length within emoji, or indeed any unicode character. "To be ...