I'm looking for a new type of "bracket" symbol for a math article, which is analogous but easily differentiated from $(\cdot),[\cdot],{\cdot},\langle \cdot\rangle,|\cdot|,<\cdot>$.
Does anyone have any ideas? (Are there any custom built symbols to this effect?). Crucially I would like it to look nice, and to have spacing rules appropriate for a bracket symbol.
For example, are there angle brackets like $\langle,\rangle$ with three segments instead of 2?