señal de alerta

(n.) = early warning signal, clarion call, warning sign, warning signal

Ex. The statistics collected served as an early warning signal for trouble spots.

Ex. The article 'A clarion call for library trustees' defends that libraries have an obligation to preserve and transmit civilisation and require the services of trustees from a wide variety of backgrounds and disciplines who will be dedicated to this cause.

Ex. Once established, a look, a nod, or a warning sign from the teacher is usually enough to remind forgetful children of the accepted mode of behavior and to prevent distractions.

Ex. The book is de-sensitized at the time of issue but if a book is removed from the library without being issued the magnetic strip activates a warning signal at the library exit.

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(n.) = early warning signal, clarion call, warning sign, warning signal

Ex: The statistics collected served as an early warning signal for trouble spots.

Ex: The article 'A clarion call for library trustees' defends that libraries have an obligation to preserve and transmit civilisation and require the services of trustees from a wide variety of backgrounds and disciplines who will be dedicated to this cause.

Ex: Once established, a look, a nod, or a warning sign from the teacher is usually enough to remind forgetful children of the accepted mode of behavior and to prevent distractions.

Ex: The book is de-sensitized at the time of issue but if a book is removed from the library without being issued the magnetic strip activates a warning signal at the library exit.