疑似

1. Origins, structure, and basic meaning

• Structure: 疑似(ぎじ) describes something made to resemble or stand in for the real thing.
• Basic usage: It describes simulated situations or objects, such as a power outage for a drill or a signal for testing equipment.

2. Common pitfalls and similar expressions

• Resemblance compared with 類似
  • 類似(るいじ) focuses on a relationship of similarity. The example's 疑似信号 is not merely a similar signal but one created to stand in for a real signal during testing.