A companion stringer, also often referred to as a plug, is a piece of a stringer (the vertical wooden piece between the top and bottom deck), that is inserted into a pallet and nailed to an existing stringer. ...
Companion stringers can be anywhere from 6 inches long to as long as 48 inches (the full length of a GMA pallet).
https://www.kampspallets.com/companion-stringers-everything-...

v. immagine
Stringer Pallet
A stringer pallet is called that because it uses “stringers,” which support the unit load. The stringers are the boards, typically 2 x 4’s or 3 x 4’s, sandwiched between the top and bottom deck boards.
When specifying a stringer pallet, the length (i.e. the length of the stringer) is noted first, and the width, or length of the deckboards is noted second.
https://larsonpkg.com/articles/different-types-of-pallets/

Stringer Pallet
Conosciuto anche come pallet a 4 vie di inforcamento, pallet a blocchetti e travetti, pallet con bordatura inferiore, Grocery pallet, GMA pallet (USA) or CPC pallet (CDA).
Questa tipologia ha una costruzione a blocchetti con travetti laterali di rinforzo (con intagli per le forche).
https://www.valdichianacarrelli.it/guida-al-pallet.html

https://www.proz.com/kudoz/dutch-to-english/transport-transp...