Final answer:
The abbreviation for Foreign Object Debris is FOD, which stands for any potentially damaging substance, debris or item alien to a vehicle or system.
Step-by-step explanation:
The abbreviation for Foreign Object Debris is FOD. Foreign Object Debris (FOD) refers to any substance, debris or article alien to a vehicle or system which would potentially cause damage. It's a term often used in the context of aviation and manufacturing to describe materials left in inappropriate locations which could damage machinery or cause safety issues. Examples include tools left out after servicing an airplane, or metal shavings on a runway that could be ingested by aircraft engines.