>True, but those are technical ones. I couldn't find any article explaining what a "strallo" is, in fact "cos'รจ uno strallo" (what is a straw) seems to be a common search based on Google's autocomplete.
It's not a "straw", it is a "stay" in English.
Strallo is a term mutuated from boats, a sail boat has a mast (albero) that is kept vertical and strong by one or more sets of "stays" (stralli):
On the sail boat the function of the stay is "opposite" to that of a bridge stay, it is used to keep the mast pressed to the base and more rigid, on a bridge they are simply "suspension supports" allowing to carry the weight of the viaduct deck and transferring the vertical load to the tower or pylon (torre o antenna).