The related question is asked here, and I cannot figure out it.
3 Answers
It is called a DNS wildcard
As an aside (it's off-topic here): The standards are defined in RFC 4592. See also https://serverfault.com/questions/215042/dns-wildcard-vs-cname-subdomains
You might be looking for the term "URL canonization".
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5I think you mean URL canonicalization or URL normalization. Canonizing a URL is up to the Space Pope.– chosterCommented Jun 22, 2012 at 16:04