COA, in accounting, means Chart Of Accounts or Cost of Acquisition.
ANGEL INVESTOR is a private wealthy individual that has no association with a venture capital firm, investment fund, etc. The "angel" invests his/her private money into what he/she believes to be promising opportunities, i.e., normally startup companies. Sometimes two or more "angels" will jointly invest into opportunities to spread the risk.
AD HOC is being concerned with a particular end or purpose, e.g., a ad hoc committee established to handle a specific subject.
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