Prosign AS

Sent as A and S run together.

Also known as: Wait prosign, Stand by

Engineering & technicalEveryday & digitalStandard profile

Meanings

The Morse procedural signal meaning wait; stand by and do not transmit.

Officially standardisedVerified fact
Signals wait; stand by and do not transmit.
Contexts: Public information, Navigation
Officially standardisedVerified fact
Holds a frequency without saying anything further, so the sending station keeps its turn while it deals with something — the equivalent of not hanging up.
Contexts: Public information, Navigation

Visual description

The letters A and S keyed as a single unbroken character, with no letter gap, written with an overbar in transcription.

Symmetry: none
Orientation: upright

Confidence

IdentityHigh confidence: High confidence because the identity is defined by a current official standard, but only a single source has been found so far.
Historical originLow confidence: Low confidence because the historical origin is documented in encyclopedic references, but only a single source has been found so far, but early or supporting evidence is limited, but the regional or cultural match to this specific claim is not precise.
Current useHigh confidence: High confidence because the current use is defined by a current official standard, but only a single source has been found so far.
Visual matchModerate confidence: Moderate confidence because the visual match is documented in encyclopedic references, but only a single source has been found so far.

Sources

Radio Regulations, procedural signals and the international phonetic alphabet
International Telecommunication Union · retrieved 2026-08-27
Cited for the identity and defined meaning of procedural signals, Q codes and the spelling alphabet. Amateur and military practice adds signals the Regulations do not define, and a record describing one says so.

Last reviewed 2026-08-27

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Meanings

The Morse procedural signal meaning wait; stand by and do not transmit.

Officially standardisedVerified fact

Signals wait; stand by and do not transmit.

Contexts: Public information, Navigation

Officially standardisedVerified fact

Holds a frequency without saying anything further, so the sending station keeps its turn while it deals with something — the equivalent of not hanging up.

Contexts: Public information, Navigation

Confidence

IdentityHigh confidence: High confidence because the identity is defined by a current official standard, but only a single source has been found so far.
Historical originLow confidence: Low confidence because the historical origin is documented in encyclopedic references, but only a single source has been found so far, but early or supporting evidence is limited, but the regional or cultural match to this specific claim is not precise.
Current useHigh confidence: High confidence because the current use is defined by a current official standard, but only a single source has been found so far.
Visual matchModerate confidence: Moderate confidence because the visual match is documented in encyclopedic references, but only a single source has been found so far.

Sources

Radio Regulations, procedural signals and the international phonetic alphabet
International Telecommunication Union · retrieved 2026-08-27
Cited for the identity and defined meaning of procedural signals, Q codes and the spelling alphabet. Amateur and military practice adds signals the Regulations do not define, and a record describing one says so.

Last reviewed 2026-08-27