Three-headed abalone and nine-headed abalone are actually not about the shape of abalone, and there will not be several abalones. The "head" here is the weight unit of abalone, and the "head" here refers to how many abalones are in a catty of abalone.
There are three heads, three abalones in a catty, nine heads and nine abalones in a catty. The fewer heads, the bigger the abalone.
Abalone is one of the precious "sea treasures" and has high nutritional value. Its meat is very tender and delicious, and it is also known as "soft gold" in the ocean.