What is the template suggestion for node 'teaser' view mode? node--[type|nodeid].tpl.php targets to node's default view mode. However I want to override the template for teaser view mode.

What is the template suggestion (.tpl.php file) for 'teaser' view mode?
I don't think there is one by default but you can easily add one in your template.php file:

function MYTHEME_preprocess_node(&amp;$vars) {
  if($vars['view_mode'] == 'teaser') {
    $vars['theme_hook_suggestions'][] = 'node__' . $vars['node']-&gt;type . '__teaser';   
    $vars['theme_hook_suggestions'][] = 'node__' . $vars['node']-&gt;nid . '__teaser';
  }
}


That will let you use a template file like: node--[type|nodeid]--teaser.tpl.php