I recently discovered that the double square brackets
stmaryrd are available as unicode characters ⟦ and ⟧, which makes them easy to use with LuaLaTex.I was even more pleased to realize that those work with
\bigl etc. without any further
DeclareMathDelimiter sorcery, they are already recognised as delimiters. That means I can write
\[ \left⟦ \sum \right⟧ \]
So I wondered, is there some list of all math delimiters that are recognized out of the box?