How to Say "indication" in Spanish
The most common Spanish word for “indication” is “indicación” — use 'indicación' when referring to a sign or symptom that suggests a particular condition, feeling, or conclusion, similar to how 'indication' is used in a medical or diagnostic context.
indicación
Examples
Su silencio es una indicación clara de que no está de acuerdo.
Their silence is a clear indication that they do not agree.
indicio
een-DEE-syohinˈdi.sjo

Examples
No hay ningún indicio de que la situación vaya a cambiar pronto.
There is no indication that the situation is going to change soon.
Su nerviosismo era un claro indicio de que algo andaba mal.
His nervousness was a clear sign that something was wrong.
Las nubes oscuras son un indicio de lluvia.
Dark clouds are a sign of rain.
Always Masculine
This word is always masculine. Even if you are talking about something feminine like 'la lluvia' (the rain), you still say 'un indicio de lluvia'.
Countable Signs
You can count 'indicios.' If there are many signs, simply add an 's' to make it 'indicios'.
Indicio vs. Señal
Mistake: “Using 'indicio' for a physical road sign.”
Correction: Use 'señal' for physical signs you can see on the street. Use 'indicio' for abstract signs or hints you figure out with your mind.
señal
Examples
Sigue las señales para llegar al centro.
Follow the signs to get to the center.
signo
síng-noˈsiɣno

Examples
La lluvia de esta mañana es un signo de que el verano ha terminado.
This morning's rain is a sign that summer has ended.
No muestra ningún signo de mejora después de la enfermedad.
He doesn't show any sign of improvement after the illness.
Vieron signos de vida antigua en las ruinas.
They saw traces of ancient life in the ruins.
Signo vs. Señal
'Signo' often refers to a physical mark or an abstract indication (like a symptom). 'Señal' usually refers to a definite signal, like a traffic light or a gesture.
Indicación vs. Indicio vs. Señal/Signo
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