Morse Code for "0" — Pattern, Mnemonic & Audio
−−−−−
0 = −−−−− (5 dahs)
Mnemonic
ZE-RO-ZE-RO-ZONE
Syllable-based memory aid
Timing
3 + 3 + 3 + 3 + 3 units
At 20 WPM: 900ms total
Type
Number
International Morse Code (ITU-R M.1677-1)
Common Words with 0
ZERO10-47030500KHZ2026
Abbreviated Numeral (Cut Number)
−−−−−
Full (5 elements)
→
−
Cut = T
Cut number: T (−). In high-speed CW, "0" is often sent as a single dash. In "599", the two 9s become N-N, giving "5NN" — the most common contest exchange.
In Amateur Radio
Appears in signal reports (599 = 5-9-9), frequencies (14.000 MHz), and contest exchanges. In cut numbers, 0 becomes T (−).
In Aviation
Appears in headings (360° = due north), altitudes (10,000 feet), and VOR frequencies (108.0 MHz). Runway 00 does not exist — runways go 01-36.
In Maritime
Appears in latitude/longitude (0° equator), vessel call signs, and MMSI numbers. The zero meridian passes through Greenwich, England.