a rod like structure
They look like rod shaped, lines, or dots depending on which one it is.
an apple
rod shaped bacterium
A strut is a rod or bar designed to resist compression.
bacilli bacteria are rod shaped.
Rod Shaped
it looks like a tie when you go to work or court or grautions
No, cocci look like clusters of grapes and rods are rod-shaped.
What you're referring to is a tie-rod. A tie-rod is a hardened straight rod that is threaded on either end. On the ends are ball joints that connect the steering knuckle to the steering rack.
There is no real answer, as anyone could make a new kind of truss rod, for example a licorice truss rod. Perhaps you mean that a truss rod could be under stress or under compression, or be designed for both.
It was made to look like that it had a rod in it.