Another example where Airbnb needs to de-Americanise its language and terminology.
In many more places the "#" key, is referred to as the "hash" key. (Or more properly, the number sign - but that can be contextually too confusing, hence the term "hash". NOTE: not hashtag, "hashtag" is the hash key, followed by a name tag, hence "hash" + "tag" = "hashtag" e.g. #thisisatag.)
For example, In Australia an automated telephone system announcement would simply say "press hash".
Outside of North America, the term "pound" key may mean the "£" key, so it should never be used by international business operators to describe the “#” key.