What's Sherlock Holmes' password?

Only the Morse code, not the Holmes code.

Morse code, also translated as Morse code, is a kind of on-off signal number, which represents different English letters, numbers and punctuation marks through different arrangement orders. It was invented in 1837, and the inventor is controversial, whether it is American Samuel Morse or Alfred Weil.

Morse code is an early form of digital communication, but it is different from modern binary code, which only uses zero and one or two states. Its code includes five types: dots, dashes, pauses between dots and dashes, moderate pauses between words and long pauses between sentences.

Extended data:

History of Morse Code Generation

Morse code plays an important role in early radio, which every radio communicator needs to know. Due to the progress of communication technology, countries have stopped using Morse code in 1999.

Morse code consists of two basic signals and different intervals. Morse code of 1837 is a number represented by dots and dashes. Numbers correspond to words. You need to look up a code table to know the numbers corresponding to each word. You can click, stroke and pause with the electric keys.

Although Morse invented the telegraph, he lacked relevant professional knowledge. Signed an agreement with Alfred Weil to help him make more practical equipment. Alfred Weil conceived a scheme in which each character and punctuation can be sent independently of each other through dots, strokes and pauses in the middle. This is the well-known American Morse code, which was used to transmit the world's first telegram.

Generally speaking, any coding method that can express written words with variable-length signals can be called Morse code. But the international Morse code, which is still in use today, only uses dots and dashes.

References:

Baidu Encyclopedia-Morse Code