Keyboard Symbols for Left & Right Arrows

There is a symbol and a minus sign, and a symbol and a plus sign on the left and right arrows on the keyboard. What are they for?

When used with the Fn key (function key), they control the brightness of the keyboard backlight.

You can use the Fn key to also get the F1 to F12 keys.

Thanks. Very helpful/useful information.

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how do i turn on the keyboard backlit

On the function keys there is a keyboard illumination icon that works by pressing the Fn key at the same time