Abbreviations:
ARU
is short for:
| Meaning | Category |
| Access/Relay Unit | Governmental->Military |
| Acción Revolucionaria Unida | International->Spanish |
| Acoustical Resistance Unit | Community->Media |
| Aracatuba, Sao Paulo, Brazil | Regional->Airport Codes |
| Audio Response Unit | Computing->General |
| Australian Railways Union | Governmental->Transportation |
| Australian Rugby Union | Community->Sports Community->Sports |
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