Amateur Radio Operators use "Q Codes" to quickly convey a message, and QSL means "Can you acknowledge receipt" or alternatively "I am acknowledging receipt".

I have separated the QSL Cards into two categories, one being QRO and the other QRP.

• QRO means the opposite of QRP and might typically be considered 100 Watts and upto the Legal Limit of
  Power for Amateur Radio.
• QRP has over time come to mean a Transmitter Power Output of 5 Watts or less.