In Japanese syllabary, how many kana systems are there?

Player #25874027, There is katana and hiragana, 2. But those two evolved from an old syllabic system that is no longer used, man'yogana. There is also ateji, I don't know where it fits in. Some words, coffee, tobacco can be spelt with ateji.

Player #25874027, that's how I read it. lol

So the answer is two but then they detail 3 and reference a 4th

what a name,kana I did not know about this,really.....