using wp_nav_menu to show a custom menu in wordpress

          $nav_args = array('menu' => "Projects");
          wp_nav_menu($nav_args);

PHP

wp_nav_menu( array $args = array(
              'menu'              => "", // (int|string|WP_Term) Desired menu. Accepts a menu ID, slug, name, or object.
              'menu_class'        => "", // (string) CSS class to use for the ul element which forms the menu. Default 'menu'.
              'menu_id'           => "", // (string) The ID that is applied to the ul element which forms the menu. Default is the menu slug, incremented.
              'container'         => "", // (string) Whether to wrap the ul, and what to wrap it with. Default 'div'.
              'container_class'   => "", // (string) Class that is applied to the container. Default 'menu-{menu slug}-container'.
              'container_id'      => "", // (string) The ID that is applied to the container.
              'fallback_cb'       => "", // (callable|bool) If the menu doesn't exists, a callback function will fire. Default is 'wp_page_menu'. Set to false for no fallback.
              'before'            => "", // (string) Text before the link markup.
              'after'             => "", // (string) Text after the link markup.
              'link_before'       => "", // (string) Text before the link text.
              'link_after'        => "", // (string) Text after the link text.
              'echo'              => "", // (bool) Whether to echo the menu or return it. Default true.
              'depth'             => "", // (int) How many levels of the hierarchy are to be included. 0 means all. Default 0.
              'walker'            => "", // (object) Instance of a custom walker class.
              'theme_location'    => "", // (string) Theme location to be used. Must be registered with register_nav_menu() in order to be selectable by the user.
              'items_wrap'        => "", // (string) How the list items should be wrapped. Default is a ul with an id and class. Uses printf() format with numbered placeholders.
              'item_spacing'      => "", // (string) Whether to preserve whitespace within the menu's HTML. Accepts 'preserve' or 'discard'. Default 'preserve'.
          ) );