A prosign is a concatenation of two characters sent without any spaces. It is usually written with a line over the top of the two characters. These are commonly used by Amateur Radio Operators.
| Prosign | Meaning/Use |
| AR | End of this message, but not the QSO. |
| AS | Wait. Can be followed by a number of minutes. Requesting the other op to standby (he may need to answer the door, match his antenna, change morse keys/headset etc). |
| BT | New paragraph, often used as a pause, break or separator between sections of a message. Some ops use it in place of normal punctuation, or as a filler whilst collecting thoughts. |
| CT HH | Commencement of transmission or formal message. Error. |
| KN | Go ahead. Passing control back to ONLY the other station. Other stations are expressly excluded. |
| SK SOS | End of the QSO – at the end of your final over after callsigns and closing protocols. Emergency/Distress call. Lives at risk. |
Last updated 30 May 2026. Ref: ITU-R M.1172
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Last modified: 30 May, 2026
