Sorry, I don't how is this element called in english. In spanish it is said to be informally a "zapatilla", but in english?
This varies country to country, even internally within English speaking countries.
In the UK, in shops they usually refer to it as a "multi-way extension lead". Also referred to as a "socket strip", "socketboard", "power strip", "extension socket", "extension cable", "plug board".
Probably a few other things.
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