The following abbreviations are commonly used in affiliate marketing.
AD – Advertisement, text, banner, flash, video etc.
CJ – Commission Junction (Network)
CPA – Cost per action
CPC – Cost per click
CPL – Cost per lead
CPM – Cost per mil (mil/mille/M = latin/Roman numeral for thousand)
CPS – Cost per sale
CR – Conversion rate
CTR – Click through rate
DRM – Dynamic rich media (type of Ad, technology). It has nothing to do with DRM as in digital rights management
EPC – Earnings per click / earnings per 100 clicks
LS – Linkshare (Network)
NCS – Nationwide Card Services (Network)
OPM – (or APM) – outsourced (affiliate) program management
PFI – Pay for inclusion
PID – Publisher ID (Affiliate/Affiliate site ID)
PF – Performics (Network)
PFP – Pay For performance
PPC – Pay per click
PPCSE – Pay per click search engine
PPI – Pay per impression
PPL – Pay per lead
PPS – Pay per sale
ROI – Return on investment
SAS – ShareASale (Network)
SE – Search engines
SEM – Search engine marketing
SEO – Search engine optimization
SERP – Search engine result page
SID – URL parameter the affiliate can pass to get tracked with sales and leads