Air Scrubber: An air scrubber is a device used to remove or reduce pollutants, contaminants, and particles from the air. It's often used in industrial settings, as well as in indoor environments to improve air quality. Air scrubbers can help remove dust, smoke, odors, and potentially harmful particles from the air.

Gas Scrubber: This is a specific type of scrubber used to remove impurities or unwanted gases from a gas stream, such as those found in industrial processes. Gas scrubbers typically use a liquid (usually water or another solvent) to capture and remove the undesired gases.

Scrubber in Ship's Exhaust Systems: In the context of ships and marine transportation, a scrubber can refer to an exhaust gas cleaning system, often used to reduce the emissions of pollutants like sulfur dioxide (SO2) and particulate matter from the exhaust gases of ships' engines. These scrubbers use a similar principle as gas scrubbers but are adapted for marine applications.

Database Scrubber: In the realm of data and databases, a database scrubber is a tool or process used to clean and sanitize data. It's often used to protect sensitive information, ensure data accuracy, and comply with data privacy regulations. This can involve tasks like removing personally identifiable information (PII) or other sensitive data from a database.

Scrubber in Cleaning: In household or industrial cleaning, a scrubber can be a tool or device used to clean surfaces. For example, a scrubber can refer to a brush or cleaning pad with abrasive properties used to remove dirt and stains from various surfaces like floors, dishes, or countertops.