Crossword Genius

Sign language (4)

Ross

I believe the answer is:

logo

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This clue could be a double definition.

'sign' is the first definition.
(logo is a kind of sign)

'language' is the second definition.
The definition and answer can be both related to communication as well as being singular nouns.
Maybe you can see a link between them that I can't see?

Can you help me to learn more?

(Other definitions for logo that I've seen before include "Small emblem or device" , "Symbolic design" , "Corporate emblem" , "A firm's sign or symbol" , "Printed symbol as organisation's emblem" .)

I've seen this clue in The Hindu.
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