Miraheze glossary

0-9 - A - B - C - D - E - F - G - H - I - J - K - L - M - N - O - P - Q - R - S - T - U - V - W - X - Y - Z

O
OOM - Out of memory

R
redis server - Redis is used for session and objection caching as well as storing the job queue which is ran by MediaWiki