枢纽

Traditional form:

樞紐

Pinyin (reading):

shūniǔ

Definitions:

• hub (e.g. of traffic network)
• hinge
• pivot
• fulcrum

Characters:

• 枢 - door hinge; pivot; center of power
• 纽 - knot; button, handle; tie

Traditional characters:

• 樞 - door hinge; pivot; center of power
• 紐 - knot; button, handle; tie