RPM
linuxRPM Package Manager — originally Red Hat Package Manager, the package format used by Red Hat, Fedora, and SUSE
Pronunciation
Correct
AR-PEE-EM
/ˌɑːˌpiːˈɛm/
Always spelled out as individual letters R-P-M. The project name is a recursive acronym: RPM Package Manager. Never pronounced as a word.
Source: rpm.org(official docs)