I would like to define new sets of delimiters for my document, but I cannot use packages like fdsymbol or MnSymbol because conflicts arise (I'm already using too many fonts). Specifically, I'm interested in defining double and triple parentheses / brackets / braces / angled brackets, and single angled brackets with a dot inside (similar to what \lBrack, \lAngle and \langledot do in fdsymbol), and the delimiters should be extensible by using modifiers such as \big and \left/\right. The ultimate objective is to use these delimiters to create shortcuts like those defined in the physics package, where e.g. \braket{a}{b} prints out something like <a|b>.
The code is probably similar to what @egreg does in [this answer][1], but he defines custom math relations instead of delimiters, and I'm afraid I don't have the necessary know-how to translate this into the code I need.
