Indicator vs Sign vs Signal

When to use each in English, with meaning, register, and examples.

Indicator

Top 1,000 (very common)C1noun

Sign

Top 1,000 (very common)A2noun

Signal

Top 1,000 (very common)B1noun
 IndicatorSignSignal
Pronunciation🇬🇧 /["/ˈɪndɪkeɪtə(r)/"]/🇺🇸 /["/ˈɪndɪkeɪtər/"]/🇬🇧 /["/saɪn/"]/🇺🇸 /["/saɪn/"]/🇬🇧 /["/ˈsɪɡnəl/"]/🇺🇸 /["/ˈsɪɡnəl/"]/
MeaningSomething that shows or points out a condition or situation.A symbol or action that shows something or gives information.A sign or message that tells someone something.
ExampleThe economic indicators are better than expected.Please follow the sign to reach the train station.The radio signal was weak, making it difficult to hear the news.
RegisterNeutralNeutralNeutral
How commonTop 1,000 (very common)Top 1,000 (very common)Top 1,000 (very common)
CEFR levelC1A2B1
Part of speechnounnounnoun
Collocationsaccurate, good, reliable, be, serve as, provide (somebody with), point to something, show something, suggest something, indicator forclassic, clear, definite, bear, have, betray, appear, come, indicate something, at a/​the sign, sign from, sign of, sign of life, a sign of the times, a sign of things to come, flashing, illuminated, neon, erect, hang, hang out, read something, announce something, proclaim something, sign for, sign to, rude, peace, thumbs-up, give (somebody), make, communicate through, language, system, sign for, make the sign of the cross, dollar, euro, pound, draw, use, mean something, sign for, birth, star, astrological, be born under, sign of, the signs of the Zodiacclear, unmistakable, agreed, give (somebody), make, send, come from something, indicate something, at a signal, on a signal, signal for, railroad, railway, traffic, operate, be on red/​green, be red/​green, fail, box, failure, faint, weak, strong, carry, pass, relay, travel, fade, intensity, strength, signal from, signal to, clear, unmistakable, agreed, give (somebody), make, send, come from something, indicate something, at a signal, on a signal, signal for
Antonymsmisleading sign, confusionignore, disregardnoise, silence
Common mistakesConfusing 'indicator' with 'indicator light' which is a more specific term., Using 'indicate' as a noun instead of 'indicator'., Mistaking it for a verb and using it incorrectly in sentences.Confused with 'sine' in mathematical contexts., Using 'sign' as a verb incorrectly, e.g., 'I will sign that paper' without indicating what or who to sign., Misusing 'sign' for 'symbol' when differentiating context.Confused with 'sign' — remember 'signal' is an act of sending a message., Using the wrong preposition, e.g., 'signal to' instead of 'signal for'., Mispronunciation, often saying 'sig-nal' instead of 'sig-nuhl'.
Usage notesUsed in both formal and informal contexts to refer to signs or signals of something. Avoid using in overly casual speech.Used in various contexts like directing people, indicating information, or marking something. More formal in legal contexts, and informal in everyday signage.Commonly used in both formal and informal contexts. In technical settings, it may refer to electromagnetic signals or communication. Avoid in very casual conversations.

Frequently asked questions: Indicator vs Sign vs Signal

What's the difference between Indicator, Sign, and Signal?

Indicator: Something that shows or points out a condition or situation. Sign: A symbol or action that shows something or gives information. Signal: A sign or message that tells someone something.

Which is more advanced: Indicator, Sign, and Signal?

Indicator is the highest level, at C1, on the CEFR scale.

Are Indicator, Sign, and Signal the same CEFR level?

Indicator: C1, Sign: A2, Signal: B1 on the CEFR scale.

What part of speech are Indicator, Sign, and Signal?

Indicator: noun, Sign: noun, Signal: noun.

Can you show an example of each?

Indicator: The economic indicators are better than expected. Sign: Please follow the sign to reach the train station. Signal: The radio signal was weak, making it difficult to hear the news.

Can I use Indicator, Sign, and Signal interchangeably?

Not always. Indicator, Sign, and Signal are related and overlap in some contexts, but they differ in register, how common they are, and usage, so swapping one for another can change the meaning or tone. Check the differences above before substituting.

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