During installation of the latest Magento security patch the interesting question appeared in my head what do numbers mean in name of patches? like 9767 or the latest one 10266?
It is related to the JIRA system Magento uses internally. The patch number is the number of the ticket in the JIRA system AFAIK.
It is to do with the JIRA system used for Magento internally. It stands for EE Support so in JIRA I assume you will see SUPEE-404 etc.