What does @ @ mean in the JS built-in function?

when browsing the js built-in functions, I see that some functions are expressed in this way 

map.@@iterator 
Map.@@species
string.@@iterator
regExp.@@match

want to know what @ @ stands for in the above representation? Is that Symbol? Why do you say that? Does this mean anything special?

Symbol javascript
Jun.18,2022

@ @ iterator in ES6 means Symbol.iterator

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