This likely refers to a specific version or session of an automated web crawler. Some researchers suggest it may denote a script designed to run during low-traffic periods (at night) to avoid rate limiting.
Leo, a data janitor for a dark-web archiving project, translated the Turkish in his head: “3 million results found exclusive.” The “fu10” looked like an error code, or a filter. Crawling Night was the name of a deep-web crawler that ran only on certain lunar phases. He’d never seen it active. This likely refers to a specific version or