A cikin ilimin lissafi, samfurin giciye shine aikin binary akan vector guda biyu a cikin sararin samaniya mai tsayi, wanda ke haifar da wani vector wanda yake perpendicular ga duka vectors na asali. Girman samfurin gicciye daidai yake da yankin araicelorogram na asali, kuma shugabanci na sakamakon haƙƙin hagu ne ya ba da izinin vector. Alamar giciye ta nuna alama ta hanyar alamar "×" kuma ana kiranta samfurin vector.