Just about anything used for fishing can be called tackle.
I know there are 'tackle boxes'.  I use them for my jewelry findings and beads.
Well a fishing rig is the completed assembly of tackle.
So, is tackle like line, lures, weights and . . .?
Also sinkers, floats, rods, reels, baits, lures, spears, nets, gaffs, traps, waders, etc...