“Material for much signage in the N.Y.C. subway system” Crossword Clue

Why this is the answer

The hint "Material for much signage in the N.Y.C. subway system" is related to the word "TILE" in English because the New York City subway system often uses ceramic tiles for signage and decorative purposes.

NYT Mini appearances

• Sunday, June 1, 20254-Down, answer: TILE

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