1. Bonds and other securities.
The early redemption (repayment) of a security's principal, before the normal final maturity date, at the discretion of the borrower (issuer), in accordance with a call provision in the security's documentation.
3. Banks and other financial institutions - accounts.
Call money means funds which can be withdrawn from a financial institution without giving notice.
4. Requests and demands.
More generally, a request or demand, which may (or may not) be legally enforceable.