Common Abbreviation I may use:

Medicine, Neuroscience, & Biology:

CNS = Central Nervous System

PNS = Peripheral Nervous System

ANS = Autonomic Nervous System

ETC = Electron Transport Chain

ACh = Acetyl-choline

DA = Dopamine

5HT = Serotonin

BDNF = Brain Derived Neurotophic Factor

NGF = Neurotrophin-4

GDNF = Glial Derived Neurotophic Factor

NT = Neurotypical

Meteorology:

TC = Tropical Cyclone

STC = Severe Tropical Cyclone

SubTC = Subtropical Cyclone

TD = Tropical Depression

TS = Tropical Storm

MH = Major Hurricane

SD = Subtropical Depression

SS = Subtropical Storm

XT = Extratropical/Post-Tropical Transition

XTC = Extratropical Cyclone

CAPE = Convective Available Potential Energy

MSLP = Mean Sea Level Pressure

SST = Sea Surface Temperatures

RH = Relative Humidity

DP = Dew Point

Kts = Knots

ACE = Accumulate Cyclone Energy

1m = 1 Minute Average Winds

10m = 10 Minute Average Winds

LLCC = Low Level Cyclonic/Central Circulation

DT = Dvorak Technique Score

CDO = Central Dense Overcast

Note: This will likely change in future in which I'll post a new version, unpin and repin the new, I've likely missed some abbreviations so if you see me use some that aren't here, nor defined in the toot itself please let me know.