fully-connected network
Technical term in computing and graph theory for a network where every node is directly connected to every other node.
In a fully-connected network, every node has a direct link to every other node.
メッシュネットワーク is a broader term for mesh networks, which may not be fully connected; 完全接続網 specifically means every node is directly connected.
Compound of 完全 (complete) + 接続 (connection) + 網 (network). A straightforward technical coinage.