Some unicode characers don't display on real devices and emulators but stay displaying within Android Studio design mode. For example, In design mode:

but the emulator (as well as real device) shows nothing:

So, why this is it? And, what should I do to gain the expected result?

UPD: As one of perheps solution I tryied to use

Also, it seems to be device specific. Troubles with Unicode string encoding in Android