verification code

基本解释

In addition some customers reflect no verification code, you have two choices.
另外有些客户反映没有验证码的情况，那么有两个选择。
Just type in the verification code and the book is securely transmitted to your mobile device.
只要输入验证码，这本书就能安全地发送到你的移动设备里。
hxen.com
Sometimes tencent is so not to lose face, want to have split up, and he pulled out a black halfway verification code.
有时候腾讯就是那么不给面子，想把已经分手的他拉黑，还要半路冲出个验证码。

Before you can sign into your Google account from a new computer or device, you have to enter a verification code that Google sends to your phone.
FORBES: Google's Advanced Email Security Can't Protect Users From Their Own Stupidity
This achieves three aims: it keeps people accountable, ensures that the code actually works while at the same time expediting the verification of code by the community of users.
FORBES: Let's Move From Breast Cancer Awareness To Collaboration Around Solutions
Would Apple ask developers to submit source code for verification?
FORBES: iPhone Apps In The Works