Jicchiku is an underground stem of bamboo that appears above the ground because it can no longer grow underground owing to obstacles such as bedrock, and characterized by its single trunk and a deep "hi" (Usually, "hi" refers to a pipe, but in tea ceremony, terminology "hi" refers to a deep groove in a bamboo trunk, where the depth increased thanks to bending, and vertical curvature).
これは地下茎が岩盤などの障害によりそれ以上延びることができずに地上に現れるもので、枝が一本で樋（ひ）が深い（実際のひとはパイプであるが、茶道の場合のひは曲げにより増した溝深さと縦屈曲）のが特徴である。