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RRN abbr.
abbr.	Recovering Racists Network; Research Resource Network; Resident Registration Number (a 13-digit number issued to all residents of South Korea regardless of nationality Ying); Relief and Rehabilation Administration
abbr., avia.	Serra Norte, PA, Brazil
abbr., comp., net., IT	Route Reestablishment Notification
abbr., earth.sc.	regional resource network
abbr., ecol.	REACH registration number (Karabas)
abbr., el.	remote request number
abbr., fin.	retrieval reference number (Баян)
abbr., geol., scient.	Red River of the North
abbr., lab.eq.	Relative Record Number
abbr., media.	Race Reports Net; Rally Racing News; Reality Radio Network; Rodeo Radio Network
abbr., mil.	Rapid Response Network
abbr., mil., air.def.	recurrence rate number