There's another Unicode bug out there that affects both iOS and macOS (including Apple Watch). This character will crash SpringBoard when you receive notification with it in the contents. If not a notification, it'll crash the app that attempts to display this.
Tested with: Model: 16GB UK O2 iPhone 6S iOS: iOS 10.0.1 (Tethered jailbreak with Yalu but not active in video) App: WhatsApp