During Naruto's sage mode training, he's seen meditating with a strange hand pose. This is actually inspired by a real-life Buddhism pose. 

In the Naruto series, the titular protagonist trains with the great sage elder toad Fukasaku on Mount Myōboku in order to learn senjutsu techniques and defeat the villainous Pain. Senjutsu is the combination of natural energy with the user's personal chakra to use powerful abilities called Sage Art.

To draw the natural energy within, the user must first enter Sage Mode. For the untrained this requires the user to become very still, adopting a meditation pose. This pose seen in Naruto actually uses a Buddhist mudra from real life, called "Mida no Jōin.