Lattice multiplication was renamed for a window grille in each culture that received it: Arabic 'shabakh' and Italian 'gelosia' both mean the same lattice grating

The name of lattice multiplication is a fossil of its journey: at each culture that received the method, it was renamed for the everyday object its diagonal-ruled grid resembled — a latticed window grille. The Arabic term, shabakh, and the Italian term, gelosia, are effectively translations of each other, both denoting the metal grille or grating (the lattice) set over a window. The English name "lattice multiplication" preserves the same image in a third language.

The renaming is not incidental decoration; it is the linguistic trace of the transmission route itself (claim-lattice-multiplication-india-maghreb-italy-transmission-chain). A method carries no intrinsic name across a language boundary, so each receiving culture supplies one from its own visual vocabulary — here, the same visual metaphor (window grille) recurring independently because the grid genuinely looks like one. This parallels how a transmitted text can arrive under a locally-meaningful new title rather than its original name, as with the fable collection at claim-kalila-wa-dimna-descends-from-borzuyas-lost-pahlavi.

Whether "renaming for local resemblance" is a general feature of cross-cultural knowledge transmission — worth its own map of content if a third or fourth instance surfaces — is the open thread at question-transmission-chains-renamed-for-local-resemblance-pattern.