A scintilla is a very small amount of something. Scintilla is usually used in negative statements, as in “not even/nary a scintilla.”

// There wasn’t even a scintilla of evidence to support their story.

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“… there was one part of his Irish childhood that would follow [Oscar] Wilde across the sea to England. A tiny part of his childhood, admittedly. The merest scintilla of his youth.” — Alexander Poots, The Strangers’ House: Writing Northern Ireland, 2023

Wonder what scintillas (or scintillae) are? It may help spark your memory to look up above the world so high at the tiny (to our eyes) stars twinkling like diamonds in the sky. Scintilla comes directly from Latin, where it refers to a spark—that is, a bright flash such as you might see from a burning ember (the noun scintilla is related to the verb scintillare, which means “to sparkle” and is responsible for the English verb scintillate meaning “to sparkle or gleam”). In the 17th century, English carried over this “glittering particle” sense, which is still in use today, as when Scottish writer Rudi Zygadlo wrote of the Gulf of Mexico “fizzing with scintillas underneath the rising sun.” In the same century, people also began using scintilla figuratively for a hint or trace of something that barely suggests its presence. Today this sense is much more common, and especially found in negative statements, such as “We have not a scintilla of doubt that you are now humming ‘Twinkle, Twinkle, Little Star.’”