A rectangle with a thin-lined X across it.

Rectangle With X

A circle marked with an X or a close button.

X On Circle Or Close Button

A computer window displaying a 4x3 grid featuring squares with different abstract designs, including stars, zigzags and dots.

An open book displaying a diagram of an atom next to a diagram of a cylinder above the equation "(x+2)". 

A 4x3 grid featuring squares with different abstract designs, including stars, zigzags and dots.

A busy and overworked manager or employee surrounded by charts, graphs, and notifications.

A professional video camera or projector with a light ray coming out of the lens, facing the side.

A turned-on adjustable swing arm desk lamp with a half-circle lampshade, emitting a curved light ray.