The Hebrew word addarkon refers to the daric, a Persian gold coin named after Darius the Great. It appears in post-exilic texts (Ezra and 1 Chronicles) when returning exiles donated to the rebuilding of the temple.
The appearance of addarkon in the context of temple donations carries deep theological significance. God's people, returning from exile, gave generously from Persian coins — secular wealth consecrated for sacred purposes. This models for the church that earthly wealth, however it comes, can be devoted to holy ends.