This was eventually shortened to 圆4 for 64 bit and x86 alone refers to a 32 bit processor. x86-32 (and x86-16) were used for the 32 (and 16) bit versions. When 64 bit processors compatible with the x86 architecture were introduced, they were referred to as x86-64. It used to be written as 80x86 to reflect the changing value in the middle of the chip model numbers, but somewhere along the line the 80 in the front was dropped, leaving just x86. The term x86 started out as a 16-bit instruction set for 16-bit processors (the 80 processors), then was extended to a 32-bit instruction set for 32-bit processors (8036), and now has been extended to a 64-bit instruction set for 64-bit processors.
It doesn't actually say anything specific about data sizes. Technically x86 simply refers to a family of processors and the instruction set they all use. It usually refers to x86 for 32 bit OS and 圆4 for system with 64 bit. Difference Between 32 bit & 64 bit Operating Systems
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