models.py:
from django.db import models
class Vis (models.Model):
    name = models.CharField(max_length = 30)
    desc = models.CharField(max_length=100)
    description = models.TextField()
    def __unicode__(self):
        return u'%s | %s' % (self.name, self.desc)
class Tov (models.Model):
    name = models.CharField(max_length = 30)
    ...
    visio = models.ManyToManyField(Vis)
 

{% for item in tov_list %}
  {{item.name}} | {{#а здесь должно быть поле name модели Vis, например item.visio.name, но так не работает}}
{% endfor %}

{% for item in tov_list %}
  {{item.name}} | {%  for vis in item.visio.all %} {{ vis.name }} {% endfor %}
{% endfor %}

{% for item in tov_list.visio.all %}
  {{item.name}}
{% endfor %}