Basic trading terminology for beginners:
PM - Pre Market
AH - After Hours
DD - Due Diligence
PT - Price Target
SL - Stop Loss
HOD - High of the Day
LOD - Low of the Day
ATH - All Time High
PH - Power Hour
EOD - End of the Day
SSR - Short Sale Restriction
HH - Higher High
HL - Higher Low
LH - Lower High
LL - Lower Low
BTO - Buy to Open
BTC - Buy to Close
STO - Sell to Open
STC - Sell to Close
ATM - At the Money
OTM - Out of the Money
ITM - In the Money