Q Signals are three letter shortcuts used in Morse Code and useful when radio operators don't speak the same language.  Here are the most common:

 

QTH: location

QSO: a Conversation

QSL: I acknowlege receipt

QSY: Change frequency

QRM; Manmade Interference

QRN: Noise

QRP: Low Power

QRT: Stopping Transmitting

 

Other common terms are

 

DX: Long distance

Ham: An Amateur Radio Operator

Phone: Voice transmissions

RTTY: Radio Teletype

Rig:  My radio

Shack: my radio room

YL: Young Lady

 

Signal reports on Morse Code are given as:

RST (Readabilty, Strength, Tone);  599 is the best.

 

Signal Reports on Voice are given as:

RS (Readability, Strength); 59 is the best.