Seacollector is a xenogender in which one collects ocean- and sea-themed genders and terms. An example would be seagender or seashantic. It was coined by u/AlpineGoats on Reddit and the name was created by their friend.
Flag
The seacollector flag was also created by u/AlpineGoats. At the time, it has no known meaning for the colours, although they likely represent the sea and ocean.