scintillation

(noun) (physics) a flash of light that is produced in a phosphor when it absorbs a photon or ionizing particle.

(noun) a rapid change in brightness; a brief spark or flash. Synonyms: twinkle, sparkling.

(noun) a brilliant display of wit.

(noun) the quality of shining with a bright reflected light. Synonyms: glitter, glister, glisten, sparkle.

(noun) the twinkling of the stars caused when changes in the density of the earth's atmosphere produce uneven refraction of starlight.