ARC Arcade
AFS Arch Filament System
ANE Anemone
AR  Active Region
BP  Bright Point
CR  Coronal Rain
CH  Coronal Hole
COM Comet
COR Corona
CHR Chromosphere
CS  Coronal Streamer
CSB Coronal Streamer Boundary
CT  Coronal Transient
CUS Cusp
DB  Disparation Brusque
DC  Disk Center
DFL Disappearing Filament
DFX Disappearing Flux
DF  Downflow
EFL Emerging Flux
ENG Engineering
EFI Erupting Filament
EPR Eruptive Prominence
EVF Evershed Flow
EXP Explosive Event
FAC Faculae
FC  Filament Channel
FLC Flux Cancellation
FLG Filigree
FIL Filament
FLR Flare
FP  Footpoint
FS  Full Sun / Full Disk
FL  Flow
GR  Granulation
HR  Hedge Row
IPH Interplanetary Hydrogen
JET Jet
LB  Loop Brightening
LE  Loop Evacuation
LMB Solar Limb
LO  Loop
CME Coronal Mass Ejection
MHR MDI High Resolution Field
MS  Magnetic Shear
MT  Mercury Transition
MW  Moreton Wave
NFL Nanoflares
NET Network
NL  Neutral Line
PAR Partial Image
PC  Polar Crown
PCH Polar Coronal Hole
PEN Sunspot Penumbra
PFL Postflare Loops
PHO Photosphere
PLG Plage
POR Pore
PP  Polar Plume
PR  Prominence
PLT Planet
QS  Quiet Sun
RIB Two-ribbon Flare
SPR Spray
SG  Supergranulation
SPI Spicule
SR  Surge
SS  Sunspot
ST  Star
SW  Solar Wind
SYN Synoptic Observation
TR  Transition Region
UF  Upflow
UMB Sunspot Umbra
VT  Venus Transition
WAV Wave
WLF White Light Flare