Out of the box the Zen theme displays the taxonomy terms of a node as inline links with no separators. If you want some text dividing the terms, try the following:
In your theme's node.tpl.php file there should be some code that looks like
<?php print t(' in ') . $terms; ?>
Replace that code with
<?php
foreach($node->taxonomy as $tid => $taxo)
$taxo_links[] = l($taxo->name,"taxonomy/term/$taxo->tid", array('title' => $taxo->name));
print t('<strong>Tags:</strong> ') . implode(' | ',$taxo_links);
?>
In this example I've used the pipe character (|) as the separator in this section implode(' | ',$taxo_links). Just replace that '|' with the character of your choice and you're good.
Found this at drupal.org Theming taxonomy terms.
