From ACT Wiki
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Call money means funds which can be withdrawn from a financial institution without giving notice.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. Guarantees and bonds - performance guarantees.
A formal demand by a commercial customer for payment under a performance guarantee.
5. Requests and demands.
More generally, any relatively formal request or demand, which may (or may not) be legally enforceable.