MRN 是什么意思？

malignant renal neoplasm 恶性肾肿瘤
multiple reflection noise 多点反射噪声
Minimal Routing Number 最小路由选择数
message reference number 信息参考号

很多种可能。你说说是哪方面的？

MRN Motor Racing Network
MRN Medical Record Number
MRN Magnetic Resonance Neurography
MRN Medicare Remittance Notice
MRN Matières Radioactives Naturelles
MRN Meteorological Rocket Network
MRN Missions Resource Network (Bedford, TX)
MRN Manufacturers Resource Network
MRN Morgue Reference Number
MRN Mouvement de la Reconstruction Nationale (French: Movement for National Reconstruction, Haiti)
MRN Material Return Note
MRN Mobile Robot Navigation
MRN Mathura Refinery Nagar (Mathura, Indian Oil Corp.)
MRN Mine Reference Number
MRN Movement Request Number
MRN Manufacturers Reference Number
MRN Mobile Random Network
MRN Material Receiving Note