Morse Code Symbology

https://www.electrical-symbols.com/electric-electronic-symbols/telegraphy-symbols.htm#morse_code_symbology

Símbolos de Motores Trifásicos

https://www.simbologia-electronica.com/simbolos-electricos-electronicos/simbolos-motores-electricos.htm#simbolos_motores_trifasicos

Telegraphy Symbols

The telegraph is an ancient system of transmission of messages over long distances, using a Morse code. Originally the medium used for the transmission of electrical impulses were cables and later through radio signals.

https://www.electrical-symbols.com/electric-electronic-symbols/telegraphy-symbols.htm

Símbolos de Sincromotores

https://www.simbologia-electronica.com/simbolos-electricos-electronicos/simbolos-motores-electricos.htm#simbolos_sincromotores

Symbols of Single-Line Switches / Unifilar

Representation single-line of switches, push-buttons and other devices responsible for establishing, sustaining and interrupt the electrical current in low power circuits.

https://www.electrical-symbols.com/electric-electronic-symbols/switches-unifilar-symbols.htm

Símbolos de Motores Eléctricos

Los motores eléctricos son dispositivos electromecánicos que transforman la energía eléctrica en energía mecánica a través de interacciones electromagnéticas. Hay otros motores (generadores) que producen electricidad aprovechando la energía mecánica, como son los alternadores y dinamos.

https://www.simbologia-electronica.com/simbolos-electricos-electronicos/simbolos-motores-electricos.htm