What is a cryptocurrency whale?

Could you elaborate on the concept of a "cryptocurrency whale" in the realm of digital currencies and finance? I've often heard this term but I'm unclear about its specific implications. Is a cryptocurrency whale an individual or entity that holds a significant amount of a particular cryptocurrency? And if so, how does their holding affect the market? Do they typically buy or sell in large volumes, influencing the price of the coin? Additionally, are there any regulatory measures or ethical considerations surrounding the actions of these whales in the crypto market? Your insights would be greatly appreciated.