Why 0 is interesting
Zero in morse is five straight dashes — the single longest numeric code. In ham radio contest exchanges, operators substitute a single T (one dash) as a cut-number to save time, turning “599” into “5NN” at 40 WPM.
Cultural and numerical context
Zero is all dashes — the most emphatic, longest-duration morse digit to send.
The ham radio cut-number alias
At fast contest speeds, operators abbreviate digit 0 with the letter T. The morse for T is shorter than the morse for 0, saving fractions of a second per character. Over a 24-hour contest with thousands of exchanges, that adds up to meaningful speed gains.
All ten digits at a glance
See the full numbers explainer for why every digit is five elements, or the alphabet for letter codes.
Frequently asked questions
What is the number 0 in morse code?
The digit 0 in international morse code is "-----" — a five-element pattern like every other digit.
Why is every morse digit five elements long?
Digits in morse have a uniform length to make them easier to recognize by ear at high speed. Letters vary in length by English frequency, but digits appear in any context so they get a consistent five-pulse shape.
What's the cut-number alias for 0?
At high contest speeds, operators abbreviate 0 with the letter T, which is shorter in morse. This is called cut-number shorthand and is context-specific to fast CW operation.