Also known as loop-back
Loopback (also written loop-back) is the routing of electronic signals or digital data streams back to their source without intentional processing or modification. It is primarily a means of testing the communications infrastructure.
回环（loopback）指将电子信号、数据流等原样送回发送者的行为。它主要用于对通信功能的测试。
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Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).