The NAR uses a bewildering number of acronyms to describe its contests. As with most things of this nature, there is a logic to the naming which makes things much easier to understand once learned. The basic structure of an event name is a prefix, the event acronym and a suffix. The prefix is always the motor code (currently 1/4A thru G) and the suffix is either an "A" for altitude events or "D" for duration events if such a distinction needs to be made (some events, such as parachute duration, have the suffix "built in" to its name, thus don't use one). A futher appendage is the use of "MR" for "Multi-Round" events where you make several flights and pick the best ones. Event Acronyms:
BG - Boost Glider
DEL- Dual Eggloft
DR - Drag Race
EL - Eggloft Single
FW - Flexwing BG
HD - Helicopter Duration
OSL - Open Spot Landing
PAY - Payload
PD - Parachute Duration
PMC - Plastic Model Conversion
PRA - Predicted Altitude
PRD - Predicted Duration
PSL - Parachute Spot Landing
R&D - Research & Development
RDA - Random Altitude
RDD - Random Duration
RC/RG - Radio Controlled Rocket Glider
RG - Rocket Glider
SC - Scale (often seen written out)
SCA - Scale Altitude (sometimes seen as Sc.Alt)
SD - Streamer Duration
SL - Spot Landing
SPSC - Sport Scale
SPSY - Space Systems
SR - Superroc
SSL - Streamer Spot Landing
STA - Set Altitude
STD - Set Duration
SUSC - Super Scale

Note that there is an ambiguity in the Eggloft event notation. "DELA" could mean the generic Dual Eggloft Altitude event or D Eggloft Altitude. For this reason, the prefixes are normally separated from the event acryonym by spaces.

Flight Card/Results Acronyms:
BRK - Broken Egg or
EGG - Broken Egg
CATO - obvious, I hope
DQ - Disqualified flight
NC - Track Not Closed
NG - No Glide
NR - No Return
PRG - Prang
ROT - No Rotation
SHR - Shread
TL - Track Lost