In Engpsh, "大号" (dà hào) can be abbreviated as "DH". However, it's important to note that this abbreviation is not commonly used and may not be understood by many Engpsh speakers. A more common way to refer to something as "large" in Engpsh would be to use the word "big" or "large", rather than using an abbreviation. For example, you could say "That's a big t-shirt" or "That's a large t-shirt" to describe a t-shirt that is larger than average.