Finger‑jointed refers to wood or engineered material where interlocking “fingers” are cut into the ends and glued together, producing longer, stronger pieces. The term is common in lumber grading, furniture, and construction.
On floor plans, ‘WH’ is a standard abbreviation most commonly used to denote a water heater. It may also refer to a wall heater or, less frequently, a washroom, depending on the context and the drafting conventions used.
SPF stands for Spruce‑Pine‑Fir, a classification used for softwood lumber in North America. It groups several species with similar strength and stiffness properties for residential and commercial construction.