Morse Code for "4" — Pattern, Mnemonic & Audio
····−
4 = ····− (4 dits, 1 dah)
Mnemonic
i-di-ot-ic-FOUR
Syllable-based memory aid
Timing
1 + 1 + 1 + 1 + 3 units
At 20 WPM: 420ms total
Type
Number
International Morse Code (ITU-R M.1677-1)
Common Words with 4
FOURTH4COURSE40WPM400HZ4SERVICE
Abbreviated Numeral (Cut Number)
····−
Full (5 elements)
→
····
Cut = H (or ····−)
Cut number: H (····) — four dots, same as the letter H. This is the most natural cut number since the abbreviated form is already a common letter.
In Amateur Radio
Appears in 40m band (7 MHz), 4-element Yagi antennas, and the 4-letter ICAO airport codes (KJFK, EGLL). Cut number: H (····).
In Aviation
4-letter ICAO codes identify every airport worldwide: KJFK (New York JFK), EGLL (London Heathrow), OMDB (Dubai). Pilots use these in flight plans.
In Maritime
Appears in MMSI numbers (9-digit Maritime Mobile Service Identity), latitude/longitude coordinates, and vessel tonnage figures.