Means the Exchange Fund Bills and bonds HKSAR Government to issue the account of the Exchange Fund, the US government issued treasury bills or treasury bills (not including the US Treasury redeemable principal of the trust (US Treasury Callable Corpus) and from the demolition of a single ticket sale STRIPS (Separate trading of Registered Interest and Principal of Securities), may from time to time and approved by the Board of Trade or other debt instruments as securities margin trading margin of use.