It can range from a foot long to over 4 feet long.
A bull horn.
"Let's take the bull by it's horn."
A "bull horn" is so named because it resembles the shape of a bull's horns, which are large and curved. The term likely originated from the animal's association with strength, power, and aggression.
A bull!
Antler.
If you get stabbed by a bull's horn, you have been gored. So it is called goring.
Handlebars (PLATO)
No, don't think so.
Mutualism
march in the streets with a bull horn
Depends entirely upon the breed of the bull. Some bulls have no horns (polled) some such as the long horn can have horns that are2-3 ft long
Yes Chief Sitting Bull defeated general George Custer at the battle of Little Big Horn.