SELinux
linuxLinux kernel security module providing mandatory access controls based on the Flask security architecture
Pronunciation
Correct
ESS-EE-LY-nux
/ˌɛsˌiːˈlaɪnʌks/
Stands for Security-Enhanced Linux. 'SE' is spelled out as letters S-E, followed by 'Linux' with the standard pronunciation /ˈlaɪnʌks/ endorsed by Linus Torvalds.
Source: selinuxproject.org(official docs)