2:2: The process of transferring 24-frame-per-second film to video by repeating each film frame as two video fields. When 24-fps film is converted via 2:2 pulldown to 25-fps 625/50 PAL video, the film runs 4 percent faster than normal. (DVD Clone)
2:3: The process of converting 24-frame-per-second film to video by repeating one film frame as three fields, then the next film frame as two fields.
3:2: An uncommon variation of 2-3 pulldown, where the first film frame is repeated for 3 fields instead of two. Most people mean 2:3 pulldown when they say 3:2 pulldown. (iPod Video Converter)