What is the meaning of Shimmer?

To shine tremulously or intermittently; to gleam faintly.

A faint or veiled and tremulous gleam or shining.

A measure of the irregularities in the loudness of a particular pitch over time.

A thin electronic device that is fit inside a card reader, such as on automated teller machines (ATMs), or point-of-sale terminals (POS's), that acts as an intermediate interface between the chip on a chip-and-pin technology card and the chip reader of the machine, to allow one to clone the chip.

to glitter

Source: wiktionary.org