Finger Spiral

In anime, sometimes a spiral is drawn on a character's finger tip, typically on their index finger, when they point the finger toward the camera. This doesn't mean anything. It's just a simple way to draw the "fingerprint," shimon 指紋, of the finger.

• guruguru-shimon
  ぐるぐる指紋
  Swirling fingerprint.

Character: Excel's shoulder angel
Anime: Excel♥Saga, エクセル♥サーガ (Episode 1)

• Examples
  • Multiple Fingers
  • Other Shapes

Examples

For reference, some examples:

Character: Katsura Yukiji 桂雪路
Anime: Hayate no Gotoku! ハヤテのごとく！ (Episode 4)

Character: Suou Tamaki 須王環
Anime: Ouran High School Host Club, Ouran Koukou Hosuto-Bu 桜蘭高校ホスト部 (Episode 12)

Character: Laharl, ラハール
Anime: Makai Senki Disgaea, 魔界戦記ディスガイア (Episode 2)

Character: Sebas, セバス
Anime: Animegataris, アニメガタリズ (Episode 2)

Multiple Fingers

Although unusual, sometimes spirals are drawn on multiple fingers rather than just one.

Character: Mile マイル
Anime: Watashi, Nouryoku wa Heikinchi de tte Itta yo ne! 私、能力は平均値でって言ったよね！ (Episode 9)

Other Shapes

Some anime don't use simple spirals but more convoluted shapes for the fingerprints. For example:

Character: Chrome クロム
Anime: Dr. Stone, ドクターストーン (Episode 7)