Do companies ever have rules about employee hair length for men or women?

I've worked at places where guys weren't allowed to have long hair. I've never worked anywhere women couldn't, though, although we weren't allowed to have any unnatural colors in our hair.Do companies ever have rules about employee hair length for men or women?
sure. some do most dont. like a mail guy cant have long hair and niether can a female one they cant have long beards or facial hair ( of a measureable length ) because they have to look friendly.and danergerous jbs like gold mining,factory working, ect you cant have long hair and ofcourse modeling- you have to look the way they want