A glint is a brief flash or flicker of light. You might enjoy gazing at the glint of light on the water as you lie on the beach in the summer time.
You can use the word glint as a noun or a verb: your brother's braces might glint in the afternoon sun, and freshly fallen snow sometimes glints under streetlamps at night. Glint is a Scottish word, first coined in the late 1700s, that comes from the Middle English glenten, "gleam, flash, or glisten." Its ultimate root is Scandinavian, possibly from the same root as the word glass.