When a UK firm borrows sterling from UK investors, it is known as a domestic bond issue.
However it is also possible for overseas firms to target Eurocurrencies when borrowing – that is money on deposit outside of its country of origin. For example if a US company wants to raise a euro-denominated loan here, the resulting bond is known as a Eurobond. Note that the issuer need not be European, the currency can be any currency held outside its country of origin and the investors being targeted to buy the security may be based in any country.