PACM

Mention PACM to me and one thing comes to mind: Pacesetters Atheletic Club Malaysia. And that's the only PACM that I am familiar with. However, try googling PACM and here are the diverse combinations you'll get:

Program in Applied and Computational Mathematics
Pennsylvania Association of Court Management
Paedophiles Against Child Molestation
Presumed Asbestos Containing Material
Pulse Amplitude Code Modulation
Phoenix Alive Christian Ministries
Phillipines Association of Catholic Missiologists
Peruvian American Club of Michigan

What a mouthful!