This CSS snippet is written for the DIVI theme by Elegant Themes. To have another hamburger icon that includes custom text. Just a simple "menu" text beneath the hamburger icon. Add this in the custom css section in the theme options:

.mobile_menu_bar.mobile_menu_bar_toggle::after {
content: "Menu";
position: absolute;
top: 38px;
right: 2px;
font-size: 12px;
}