| Subject | English | Chinese |
| anim.husb. | double code | 双联密码 |
| tech. | double code | 对偶码 |
| tech. | double difference code | 二异码 |
| el. | double error correcting code | 双纠错码 |
| oil | double stencil pipe grade code | 双标记钻杆钢级代号 |
| telecom. | double-current cable code | 双流水线电码 |
| el. | vibrator double-current cable code | 振动双流电报码 |
