纽带
niǔ dài · HSK 7
link
🪢 纽 (knot/button) + 带 (belt/band) = a knot-band that links things: a bond
纽 means a knot or fastening button, and 带 means a belt or band. Together they name the binding cord that ties two things together, hence a tie, link, or bond. Both halves carry the 纟 silk-thread radical, marking cords.
带 — belt/sash 巾 at bottom + ornaments above
带 originally pictured a belt or sash with hanging ornaments or pendants tied at the waist; the bottom 巾 (cloth) reinforces the textile meaning. From the literal 'belt' it extended to 'carry, bring along' (as a belt holds things) and to 'zone/region' (a strip of land).