1. Plural of callout; instances of calling out or summoning someone, especially in an emergency or urgent situation.
Usage: Common in professional contexts (emergency services, customer service)
2. Text, labels, or annotations that point to or highlight specific elements in a visual design, diagram, or document.
Usage: Common in design, technical writing, and software documentation
3. Public criticism or challenge directed at a person or organization, often on social media.
Usage: Informal; modern usage

Examples

• The fire department received multiple emergency callouts during the storm.
• The diagram includes callouts that explain each component of the engine.
• The designer added callouts to highlight the key features of the new interface.
• Social media callouts can damage a company's reputation if not handled carefully.
• Customer service callouts increased significantly during the holiday season.
• The technical manual uses callouts to draw attention to important safety warnings.