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 for PowerPC
From The Free On-line Dictionary of Computing (30 December 2018) :

      (PPC) A RISC microprocessor designed
     to meet a standard which was jointly designed by Motorola,
     IBM, and Apple Computer (the PowerPC Alliance).  The
     PowerPC standard specifies a common instruction set
     architecture (ISA), allowing anyone to design and fabricate
     PowerPC processors, which will run the same code.  The PowerPC
     architecture is based on the IBM POWER architecture, used in
     IBM's RS/6000 workstations.  Currently IBM and
     Motorola are working on PowerPC chips.
     The PowerPC standard specifies both 32-bit and 64-bit data
     paths.  Early implementations were 32-bit (e.g. PowerPC
     601); later higher-performance implementations were 64-bit
     (e.g. PowerPC 620).  A PowerPC has 32 integer registers (32-
     or 64 bit) and 32 floating-point (IEEE standard 64 bit)
     floating-point registers.
     The POWER CPU chip and PowerPC have a (large) common core, but
     both have instructions that the other doesn't.  The PowerPC
     offers the following features that POWER does not:
     Support for running in little-endian mode.
     Addition of single precision floating-point operations.
     Control of branch prediction direction.
     A hardware coherency model (not in Book I).
     Some other floating-point instructions (some optional).
     The real time clock (upper and lower) was replaced with the
     time base registers (upper and lower), which don't count in
     sec/ns (the decrementer also changed).
     64-bit instruction operands, registers, etc. (in 64 bit
     See also PowerOpen, PowerPC Platform (PReP).
     IBM PPC info
     (gopher://info.hed.apple.com/), "Apple Corporate News/"
     (press releases), "Apple Technologies/" and "Product
     Information/".  (gopher://ike.engr.washington.edu/), "IBM
     General News/", "IBM Product Announcements/", "IBM Detailed
     Product Announcements/", "IBM Hardware Catalog/".
     Usenet newsgroups: news:comp.sys.powerpc,
     ["Microprocessor Report", 16 October 1991].

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