8B

8b is a two-character designation that can refer to different things depending on context. In computing, the most widely recognized use is as the hexadecimal byte 0x8B, an opcode in the x86 and x86-64 instruction set. This byte signals a MOV instruction, specifically moving data from a register to a memory location or from one register to another, with additional bytes (such as ModR/M, SIB, and displacement) determining the exact operands. The precise meaning of 8B depends on the operand size (16, 32, or 64 bits) and the following encoding bytes that specify registers and addressing modes. In disassembly and machine code, sequences beginning with 8B are common and typically indicate data transfer operations.

Outside of this specific encoding, 8b has no universal standard meaning and may appear as a label, part number, version suffix, or identifier in various contexts. For example, in software catalogs, product names, or project codes, 8b can be used without implying a specific technical standard. Its interpretation is defined entirely by the surrounding documentation or conventions of a given domain.

In summary, 8b most notably denotes the x86 MOV opcode in machine code, but as a two-character string it can also function as an arbitrary label in non-technical contexts. When encountered in binary or assembly code, the 8B byte is best understood through the broader instruction encoding and architecture references. See also x86 architecture, MOV instruction, and opcode encoding.