rfa = remote file access server
It is port 4672 on udp and tcp.
Your output really means this:
DNAT udp -- anywhere anywhere udp dpt:4672 to:192.168.0.2
DNAT tcp -- anywhere anywhere tcp dpts:4661:4672 to:192.168.0.2
If you look in /etc/services you can see what other abbreviations and aliases for port numbers are.
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