tcp flags

["Basil Saragoza" <snortlst () hotmail com>]

I looked at the rules and noticed that quite often tcp flag set to flags:A+
I used to think that tcp flags were:
SYN (s), ACK (ack),  FIN (f), RESET (r), PUSH (p), URGENT (urg), and
Placeholder (.).

What is A+ as tcp flag? Are there any others I'm not aware of?
thx.

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