No Operation option. Usually used to pad out options to fit a 4-byte alignment.

www.networksorcery.com/enp/protocol/tcp/option001.htm

Methods
D
N
Class Public methods
new(args={})

Source: show 

# File lib/packetfu/protos/tcp.rb, line 325
                        def initialize(args={})
                                super(
                                        args.merge(:kind => 1)
                                )
                        end
Instance Public methods
decode()

Source: show 

# File lib/packetfu/protos/tcp.rb, line 331
                        def decode
                                "NOP"
                        end