zubaan means tongue but metaphorically it also means word, voice, language, speech and dialect.
Beautifully used in this sher by Sahir Hoshiyarpuri:
Kaun kehta hai mohabbat ki zubaan hoti hain
Yeh haqeeqat to nigahon se bayan hoti hain
Who says that love has a language
This truth can only be expressed through a glance, a look
Zubaan is also the name of leading independent publishing house based in New Delhi with a strong academic and general list. It was set up in 2003 as an imprint of India’s first feminist publishing house, Kali for Women, and continues to publish books on, for, by and about women in South Asia.
More details can be found here:http://zubaanbooks.com/about-zubaan/