In hyperledger when @ symbol is used in comments and it has its significance and is required before defining a function. I was going through some solidity code examples and I saw this piece of code
/**
* @title Ownable
* @dev
*/
so does that @ has any use or significance?
These are "NatSpec" comments. The Solidity documentation has this to say:
Additionally, there is another type of comment called a natspec comment, for which the documentation is not yet written. They are written with a triple slash (
///) or a double asterisk block(/** ... */) and they should be used directly above function declarations or statements. You can use Doxygen-style tags inside these comments to document functions, annotate conditions for formal verification, and provide a confirmation text which is shown to users when they attempt to invoke a function.
The wiki has a bit more about them: https://github.com/ethereum/wiki/wiki/Ethereum-Natural-Specification-Format.
I'm not sure which tools actually consume these comments, but hopefully that documentation will get you started in learning more.
It's not something that is required before defining a function.
The solidity compiler uses doxygen-style NatSpec tags inside comments to optionally document functions, annotate conditions for formal verification, and provide a confirmation text that is shown to users when they attempt to invoke a function.
The different types of tags are:
@title@author@notice@dev@param@return