BM

= Back Marker,回指标记，回指符号;

= Bad Machine, 有故障的机器[设备];

= Balanced Modulator, 平衡调制器;

= Bill of Material, 用料单;

= Binary Multiply, 二进制乘法;

= BlockMark, 块标志;

= Buffer Mark, 缓冲器标记