arithmetic/logic unit: the part of a central processing unit that performs arithmetic and logical operations.
arithmetic and logic unit
Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Arithmetic and Logic Unit
Association of Lisp Users
The Free On-line Dictionary of Computing, © Denis Howe 2010
arithmetic logic unit
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
The term alu is sometimes abbreviated, encrypted or written with grammatical expansion.
They have both been interpreted as alu, but it is not certain.