A wrapper is a term for a financial product - like an <a title="ISA" href="https://quoteddata.com/glossary/isa/">ISA</a>

Wrappers may contain many types of investment, such as Investment Trusts and <a href="https://quoteddata.com/glossary/oeic/">open-ended investment company (OEIC) funds</a>.

Wrapper is also the generic name for financial products such as Personal or Self Invested Personal Pensions.