This figure also illustrates the reason why the versine was sometimes called the sagitta, Latin for arrow,[18][36] from the Arabic usage sahem[38] of the same meaning. This itself comes from the Indian word 'sara' (arrow)[citation needed] that was commonly used to refer to "utkrama-jya". If the arc ADB of the double-angle Δ = 2θ is viewed as a "bow" and the chord AB as its "string", then the versine CD is clearly the "arrow shaft".