# MOUSE_BUTTON_3

- **Language:** C
- **Kind:** constant
- **Source:** https://github.com/tmux/tmux/blob/e476c1230b958df0cb12977517d24b3dc931375b/tmux.h#L1570
- **Page:** https://libtmux.org/en/tmux/3.7c/reference/c-define-tmux-h-mouse_button_3/

```c
#define MOUSE_BUTTON_3 2
```

## Referenced by

- [`popup_key_cb`](/en/tmux/3.7c/reference/c-function-popup-c-popup_key_cb/) (function)
- [`server_client_check_mouse`](/en/tmux/3.7c/reference/c-function-server-client-c-server_client_check_mouse/) (function)