⑨

A diagram of gameplay in the manual of Phantasmagoria of Flower View- A Competetive Danmaku game and 9th game in the mainline Touhou Series developed by Team Shanghai Alice- labelled Cirno with the legend ⑨ and the key ９. バカ (“9. Idiot”).

Noun

⑨(まるきゅう) • (maru-kyū)

(Can we verify⁽⁺⁾ this sense?) (fandom slang, endearing) The Touhou Project character Cirno
- 2006, “⑨、変（こい）のバラッド”, in hellnian [hellnian] (lyrics), 東方不可拘束～the maximum moving about!～‎^THW, performed by 石鹸屋:
  
  好(す)きなだけ笑(わら)いなさい　⑨(まるきゅう)と呼(よ)びなさい
  Sukina dake warainasai maru-kyū to yobinasai
  Please laugh as much as you want; please call me circle-nine
- 2008, “⑨destiny ～ずっとチルノのターン”, in bit [bit] (lyrics), Rebirth [Rebirth]‎^THW, performed by Silver Forest [Silver Forest]:
  
  ⑨(まるきゅう)って言(い)うな～
  Maru-kyū tte iu na~
  Don't call me circle-nine~

Noun

⑨(ばか) • (baka)

(Can we verify⁽⁺⁾ this sense?) (fandom slang) alternative spelling of 馬鹿 (baka, “idiot”), in reference to the Touhou Project character Cirno
- 2008, “⑨でも糖分はいるよっ”, in 溝口ゆうま (lyrics), 東方スイーツ‎^THW, performed by Innocent Key [Innocent Key]:
  
  ⑨(ばか)でも糖分(とうぶん)はいるよっ
  Baka de mo tōbun wa iru yo'
  Even idiots need sugar!
- 2009, “彩祭雷禮”, in くまりす (lyrics), Scattered Destiny [Scattered Destiny]‎^THW, performed by EastNewSound [EastNewSound]:
  
  金魚(きんぎょ)もった　魔女(まじょ)の肩(かた)に　⑨(ばか)
  kingyo motta majo no kata ni baka
  (please add an English translation of this example)
- 2010, “チルノンクエスト⑨～そして闇鍋へ～”, in いずみん (lyrics), Heartcore Forte [Heartcore Forte]‎^BandcampTHW, performed by Halozy [Halozy]:
  
  材料求(ざいりょうもと)めたふもとの村(むら)では
  「⑨(ばか)だ・・・!⑨(ばか)だ・・・!」と石(いし)を投(な)げられ
  zairyō motometa fumoto no mura de wa
  “baka da ! baka da !” to ishi o nagerare
  In the village at the foothills where I went in search of ingredients,
  they threw rocks at me, declaring "it's the idiot! it's the idiot!"

Numeral

⑨(きゅう) • (kyū)

(fandom slang) alternative spelling of 9 (kyū, “nine”), in reference to the Touhou Project character Cirno