tate-hiza 立膝 (Sitting with One Knee Up)

In Japanese, tate-hiza 立膝, meaning "standing knee," is a way to sit on the floor: with one knee up.

Left: Cthuko クー子
Middle: Yasaka Mahiro 八坂真尋
Right: Nyaruko ニャル子
Anime: Haiyore! Nyaruko-san 這いよれ！ニャル子さん (Episode 3)

• Context: three characters sit differently.
• Left: W sitting.
• Middle: tate-hiza 立膝.
• Right: seiza 星座.

It's also spelled tate-hiza 立て膝, with okurigana,

• Samurai

Samurai

The tate-hiza is sometimes associated with samurai 侍 and sword-carrying characters, as it's said to be a position quick to get up from and defend yourself in case of ambush.

Sword-carrying characters sometimes keep the sword in front of them while sitting, the sword leaning on their shoulders.

Character: Himura Kenshin 緋村剣心
Anime: Samurai X, Rurouni Kenshin: Meiji Kenkaku Romantan るろうに剣心 -明治剣客浪漫譚- (Episode 6)

• Context: Kenshin sitting ready to slay.
• Other characters sit in seiza, except for the one wearing a sarashi さらし, who sits in agura あぐら.