An exclamation symbol in a square speech bubble. 

Speech Bubble With An Exclamation Mark

An icon of a bell with a small circle containing the number zero. 

Bell With Zero Icon

A laptop with a crack in the screen, a sad face with Xes for eyes, warning signs, and the numbers 404, representing a 404 Not Found error.

A round speech bubble with two exclamation signs.

Two exclamation symbols in a square speech bubble with curved edges.

A warning sign with an exclamation mark in a triangle with curved edges.

An Earth planet icon with a triangle containing an exclamation point and a rectangular, blank speech bubble.

An icon of a bell with a speech bubble containing ellipses.

Two blocky exclamation marks next to each other.

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

A triangular sign with an exclamation mark above an envelope.