• 欄らん — column; section
• 欄外らんがい — outside the column / margin note
• 空欄くうらん — blank field
• 記入欄きにゅうらん — entry box (on a form)
• 投書欄とうしょらん — letters-to-the-editor column
• 案内欄あんないらん — information section
• 欄干らんかん — railing; balustrade

With the 木 radical, this character pictures framed spaces made of wood — from 欄干 rails to printed 欄 boxes. It’s about boundaries that guide the eye or the body.

Picture a page divided into neat wooden frames — each box is a 欄. Notes that spill beyond the frame land in 欄外（らんがい） — the margin. The feel is “inside the box vs. outside the box,” a simple way to remember how 欄 marks a bounded area.