party, gang, clique
聨 centers on a group of people bound together by shared purpose or association: a party, gang, or clique. The idea is one of connection and belonging to a tight-knit unit.
聨 is a variant form of 聯, which originally depicted threads (絲) being joined together by an ear-like handle (耳), conveying the idea of connection or linking. The modern form simplifies the right side but retains the core meaning of association.
The left side 耳 (ear) suggests listening or being part of a group, while the right side looks like threads (幺) being held together by hands (廾). Imagine a group of people linked together like threads, forming a party or clique.
For レン, picture a group of friends forming a clique and linking arms in a chain: chain -> レン, and they are all connected like a gang.