How many letters does the top answer for “the shorter of the two telegraphic signals used in morse code” have?

The most common answer is dit (3 letters).

Crossword clue: the shorter of the two telegraphic signals used in morse code

1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

dit 3 letters wn-def

the shorter of the two telegraphic signals used in Morse code