Comma (,) in Morse Code
--..--
Two dashes, two dots, two dashes: — — · · — — . That symmetry isn't accidental dressing — reverse every symbol and you get the question mark's code exactly, dot for dash and back again.
The Mirror of the Question Mark
Reverse every symbol in the comma's code — dash becomes dot and dot becomes dash — and the result is the question mark's exact code, dot-dot-dash-dash-dot-dot. It's one of the cleaner opposite pairs in the character set: two marks with completely different meanings, built from precisely inverted versions of the same six-symbol pattern.
Why the Comma Runs Long
Punctuation marks generally get longer, more distinctive codes than common letters, since misreading a comma as a nearby letter mid-message is a more disruptive error than misreading one letter for another similar one. The comma's dash-heavy bookends make it stand out clearly even against a weak or noisy signal, at the cost of taking longer to send than any ordinary letter.
Frequently Asked Questions
Why are punctuation codes generally longer than most letters, using the comma as an example?
A shorter code risks being misread as a common letter mid-sentence, which is a more disruptive error for punctuation than for two similar letters — so the comma's six symbols trade sending speed for a shape that's hard to mistake for anything else.
Is the comma related to any other punctuation code?
Yes — it's the exact mirror image of the question mark's code; reversing every dot and dash in the comma produces the question mark's pattern precisely.