handrail

/ˈhændreɪl/
noun
  1. A long, narrow bar that you hold onto for support, usually on stairs or in a hallway.
    • The old wooden handrail in the theater was polished smooth by years of use.
    • Please keep one hand on the handrail when using the escalator.
    • She gripped the handrail tightly as she walked down the steep stairs.