V is the reverse Greek letter λ, which can be entered by QQ Pinyin input method as follows:

1, first switch the computer input method to QQ pinyin input method;

2. Then place the mouse cursor at any position in the status bar of QQ Pinyin Input Method, and then click the right mouse button;

3. In the pop-up page, click "Symbol Input";

4. Then click "Special Symbol";

5. After entering the symbol input device, click "Greek/Russian" on the left. The penultimate symbol in the second line on the right is λ, which is the opposite symbol of V, and click it to enter;

6. The input result is shown in the figure below.