Adding “tech” or “tech meaning” to the end of an unfamiliar abbreviation can help refine the searches. In my case “tech meaning” brings up a Quora question that answers this.

Alternatively, you can Google “what is an IC hacker news” and you can find previous threads where this was asked and defined.

If you have a question about an abbreviation being used in HN (Hacker News), it’s probably something others have asked about before.