Cage

A term used to describe the department of a brokerage firm that receives and distributes physical securities.

Investopedia Says:
A reference mainly used by industry workers, the cage is like a vault where all certificates and bonds are held in physical form.

Section of a brokerage firm's back office where funds are received and disbursed.

Also, the installation where a bank teller works.

Part of the fulfillment operation that receives, opens, and sorts mail and prepares bank deposits from all monies received. The name is derived from old-time fulfillment operations that were enclosed by metal fences or gates for security. This level of security was necessary when cash, rather than checks or money orders, was frequently sent through the mail. See also cashier.

The noun has one meaning:

Meaning #1: United States composer of avant-garde music (1912-1992)
  Synonyms: John Cage, John Milton Cage Jr.