What does "4M" mean in the headline I have clipped here? I keep seeing it but don't know how to look up what it means.
Iglesias, confirmado por las bases como candidato de Podemos el 4M
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4M stands for '4 de mayo', and in this case it refers to the date when the Madrilenian regional election in Spain will be held: May 4th, 2021. So the capital letter corresponds to the initial letter of the month.
In Spanish we tend to use these acronyms for dates, so it is easier to refer to them once they've become quite known among the readers of that field.
Some of these acronyms are still famous:
Whereas others have a limited time life and end up vanishing after the event is over.