Pallets are standardized, but in different sizes. It can also mean damaged or rotten.

Two-way pallets are designed to be lifted by the deckboards. The standard 48x40 North American pallet, or GMA pallet, has stringers of 48 inches and deckboards of 40 inches, and was standardized by the Grocery Manufacturers Association. A standard wooden pallet (48 in × 40 in × 6 in or 122 cm × 102 cm × 15 cm) with a static load bearing capacity of 3 short tons (2.7 long tons; 2.7 t) and a 1-short-ton (0.89-long-ton; 0.91 t) dynamic capacity, will weigh approximately 33 to 48 lb (15 to 22 kg) Lightweight plastic pallets can weigh as little as 3 to 15 pounds (1.4 to 6.8 kg), while heavier models may weight up to 300 pounds (140 kg). "Standard GMA pallets can hold up to 460 pounds (210 kg). GMA pallets typically weighs 37 pounds (17 kg), and are 6 1⁄2 inches (170 mm) tall. Their deck boards measure 3 1⁄4 inches (83 mm) wide and are 5⁄16 inch (7.9 mm) thick each. Other dimensions of pallets have different weight capacities.
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The International Organization for Standardization (ISO) sanctions six pallet dimensions, detailed in ISO Standard 6780:2003 Flat pallets for intercontinental materials handling — Principal dimensions and tolerances, which was reviewed and confirmed in 2014:[2]
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Old and discarded wooden pallets can be used in pallet crafts and various furniture pieces.[31]
https://en.m.wikipedia.org/wiki/Pallet