Who coined the term "Spell Card" and when?

[Cyan Person]

Read the title, I guess

[Yoshi Mario]

are we talking in universe or in real life because if its in universe proably reimu other wise maybe a group of yoki and if its in real life then i dont have a clue.

[FiliStradivarius]

In real life, it's probably ZUN the creator of Touhou.

[Guihong Wang]

spell card? 

i think chinese translate 符卡（fu 1 ' Ka 1  This is 符卡‘s pinyin) is better

Asian think 符 Used to drive away ghosts 

So we think 符 has a kind of spiritual power（just like TH18's card)

This is my own explanation (from Asia)