Hood
Hood turns up in 2 fields: welding, automotive. Here is what it means to the people in each one.
Hood in welding
Shop word for the welding helmet, with the dark filter lens that protects eyes and face from the arc.
Helmet that shields the eyes and face from arc radiation, spatter and heat. Filters are rated by shade number: around 10 for light stick and TIG work, 11 to 12 for most MIG and mid-range stick, up to 14 for heavy currents and air carbon arc, and only 3 to 6 for oxyfuel cutting. Auto-darkening hoods switch to dark in a fraction of a millisecond when the arc strikes, while fixed-shade hoods are flipped down with a nod of the head.
"Drop your hood before you strike, or you'll be up all night feeling like there's sand in your eyes."
Hood in automotive
The hinged metal or composite panel that covers the engine compartment of a vehicle.
The primary body panel protecting the engine bay from weather and debris while providing aerodynamic flow over the front of the vehicle. In British terminology, this word refers specifically to the folding fabric roof of a convertible, while the engine cover is called a bonnet.
"Pop the hood and let me check the transmission fluid while it's running."