The term x86 refers to a family of instruction set architectures[1] based on the Intel 8086. The term is derived from the fact that many early processors that are backward compatible with the 8086 also had names ending in "86".
And, quoting the first one :
The Intel 80386, also known as the i386, or just 386,[1] was a 32-bit microprocessor introduced by Intel in 1985. [...] As the original implementation of the 32-bit extensions to the 8086 architecture, the 80386 instruction set, programming model, and binary encodings are still the common denominator for all 32-bit x86 processors. This is termed x86, IA-32, or the i386-architecture, depending on context.
80386/i386 was the first 32-bit Intel processor. When it was introduced, lot of compilers started using i386 as a flag to turn code-generation for it, a name for various temporary files, and architecture denominations in file names. 80386 was succeeded by 486, 586 (aka Pentium) and the rest of the x86 architecture CPUs. But the i386 stuck around as a label and is used as an alias to x86 (just like amd is used as an alias to x64 architecture, even though there are Intel x64 processors as well).
它只是同一架构的另一个同义词。虽然它并不完全准确，但 80386 是 32 位 x86 指令集的原始实现，也是该架构所有后续 CPU 的共同点。
It's just another synonym for the same architecture. It's not entirely accurate but the 80386 is the original implementation of the 32-bit x86 instruction set and the common denominator for all following CPUs of that arch.
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i386 只是 x86 处理器和指令集系列中的第一个型号。
有关更多信息，您可能需要查看：
引用第二页：
并且，引用第一个：
i386 is just one the first model in the x86 familly of processors, and instructions sets.
For more informations, you might want to take a look at :
Quoting the second page :
And, quoting the first one :
80386/i386 是第一个 32 位 Intel 处理器。当它被引入时，许多编译器开始使用 i386 作为一个标志来为其生成代码、各种临时文件的名称以及文件名中的体系结构名称。 80386 的后继者是 486、586（又名 Pentium）和其他 x86 架构 CPU。但 i386 仍然作为一个标签存在，并被用作 x86 的别名（就像 amd 被用作 x64 架构的别名，尽管也有 Intel x64 处理器）。
80386/i386 was the first 32-bit Intel processor. When it was introduced, lot of compilers started using i386 as a flag to turn code-generation for it, a name for various temporary files, and architecture denominations in file names. 80386 was succeeded by 486, 586 (aka Pentium) and the rest of the x86 architecture CPUs. But the i386 stuck around as a label and is used as an alias to x86 (just like amd is used as an alias to x64 architecture, even though there are Intel x64 processors as well).
它只是同一架构的另一个同义词。虽然它并不完全准确，但 80386 是 32 位 x86 指令集的原始实现，也是该架构所有后续 CPU 的共同点。
It's just another synonym for the same architecture. It's not entirely accurate but the 80386 is the original implementation of the 32-bit x86 instruction set and the common denominator for all following CPUs of that arch.
i386 比 x86 更具体，但是，它们大致相同。
i386 is more specific than x86, but yes, they're approximately the same.