桟 means “jetty, plank frame, lattice”

さん · san

Also: scaffold, cleat, frame

Kun'yomi (Japanese reading)
かけはし
On'yomi (Chinese reading)
サン, セン

JLPT N1 · Taught in secondary school · 10 strokes

The story

Wood (木) cut into thin strips (戋, the part in 浅, shallow): planks laid side by side. A 桟橋 is a wooden pier reaching out over the water, the grid of a shoji screen is its 桟, and kabuki's 桟敷 are raised seats along the walls.

Used in 桟橋 (sanbashi, pier/jetty) and 桟敷 (sajiki, raised box seats)

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Readings from KANJIDIC2, © EDRDG, CC BY-SA.