Parenthesis in Chord Symbols
Some musicians tend to write all extensions after the first extension between parenthesis. Thus, they would write
G7(>9)
instead of G7>9
, and D7(<9<5)
instead of D7<9<5
. This way of notating can be seen in The New Real Book. But apart from that publisher, not a lot of books use this method. Here is een example of Take the A Train: