How to Say "plus sign" in Spanish
The Spanish word for “plus sign” is “positivo” — B1 level. This is a very common word in everyday Spanish.
English → SpanishB1
nounB1
mathematics (el positivo)

Examples
Lamentablemente, mi prueba de COVID dio positivo.
Unfortunately, my COVID test came back positive.
Necesitas conectar el cable rojo al positivo de la batería.
You need to connect the red cable to the battery's positive terminal.
El técnico confirmó que había dos positivos en el laboratorio.
The technician confirmed there were two positive cases in the lab.
Using 'Dar'
When talking about a test result, Spanish often uses the verb 'dar' (to give) instead of 'ser' (to be) or 'venir' (to come back). Example: 'La prueba dio positivo' (The test gave a positive result).
Related Translations
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