noun
slip of paper; paper tag; label
A small piece of paper used for notes, labels, or tags. Often found in compounds like 付箋 (sticky note) or 処方箋 (prescription).
本に付箋を貼って重要な箇所をマークする。
I put sticky notes in the book to mark important passages.
noun
tag; label (bamboo, wood, ivory, etc.)
A physical tag or label, traditionally made of bamboo, wood, or ivory, used for identification or marking. Modern usage extends to any small label or tag.
骨董品には象牙の箋が付けられていた。
An ivory tag was attached to the antique.
The kanji 箋 originally referred to bamboo slips used for writing in ancient China. The reading せん is the on'yomi. The variant 籤 shares the same reading and similar meaning but is less common.