When a character is [[standing on one leg]] while the other leg is raised so high that it looks like the person is doing a vertical [[split]].

Not to be confused for a [[high kick]] or [[axe kick]].

In October 2020, the pose became a Twitter [[meme]] under the hashtag "#I字バランス部":[https://twitter.com/hashtag/I字バランス部]. It originated with post #4129230 and post #4119640; see comment #2047996 for details.
Y字バランス I字バランス 淫蘭 I字バランス部 站立劈叉