A large X over a rectangular window or panel with a solid bar on the top and center-aligned lines indicating text.

X Over Window Text Block

A warning sign with exclamation mark in a rounded triangle.

Alert Icon

A rectangular sign held up by two posts, with the numbers 404, representing a 404 Not Found error.

A speech bubble with an exclamation mark.

A round speech bubble with an exclamation mark.

A rounded siren or warning light with a rectangular base.

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