Can individual variables be set to no_log?

I thought I ran across a playbook output that indicated individual variables had been set with a no_log parameter. Unfortunately, I cannot find the website where I saw it yesterday. Is it actually possible to specify no_log by variable?

Thanks!
Joanna

Looks like you can do it by play or for an entire playbook:

http://docs.ansible.com/ansible/faq.html#how-do-i-keep-secret-data-in-my-playbook