Final answer:
The motto Mowlana Sultan Muhammad Shah gave to the Aga Khan volunteers of Burma, which is now globally used by Aga Khan volunteers, is "Work for Unity".
Step-by-step explanation:
Mowlana Sultan Muhammad Shah, also known as Aga Khan III, gave the Aga Khan volunteers of Burma a motto that is now used worldwide by Aga Khan volunteers. The motto given by him is: "Work for Unity". This ethos aligns with the broader mission of the Aga Khan Development Network to promote the welfare and advancement of human civilizations through unity, compassion, and cooperative effort.