upstage left pillar (noh stage)
Refers to the pillar on the noh stage located upstage left, next to where the flute player sits. This is a specialized term used in the context of noh theater.
On the noh stage, the flute player sits near the upstage left pillar.
Compound of 笛 (fue, 'flute') and 柱 (hashira, 'pillar'), referring to the pillar near the flute player's position on a noh stage.