We’re rewarding the question askers & reputations are being recalculated! Read more.

For challenges related to Morse code.

Morse code is an encoding for letters and digits using up to five short and long segments per character.

Challenges with this tag will usually encode or decode some message in Morse.

Unless specified otherwise, challenges refer to the International Morse Code, defined by the following table:

A   ._          1   .____
B   _...        2   ..___
C   _._.        3   ...__
D   _..         4   ...._
E   .           5   .....
F   .._.        6   _....
G   __.         7   __...
H   ....        8   ___..
I   ..          9   ____.
J   .___        0   _____
K   _._
L   ._..
M   __
N   _.
O   ___
P   .__.
Q   __._
R   ._.
S   ...
T   _
U   .._
V   ..._
W   .__
X   _.._
Y   _.__
Z   __..

If the timing of segments and breaks play a role, the International Morse Code defines them as follows:

  • A short segment lasts 1 unit.
  • A long segment lasts 3 units.
  • A break within a letter lasts 1 unit.
  • A break between letters lasts 3 units.
  • A break between words lasts 7 units.
history | excerpt history