Tech Acronyms - Three Letter Naming Convention for IT

dev – development
tst – Testing
stg – Staging
prd – Production

app – Application Server (non-web)
sql – Database Server
ftp – SFTP server
mta – Mail Server
dns – Name Server
cfg – Configuration Management (puppet/ansible/etc.)
mon – Monitoring Server (nagios, sensu, etc.)
prx – Proxy/Load Balancer (software)
ssh – SSH Jump/Bastion Host
sto – Storage Server
vcs – Version Control Software Server (Git/SVN/CVS/etc.)
vmm – Virtual Machine Manager
web – Web Server