Bitcoin full node and query server

Apr 12, 2021

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P
Phil14:20
Dear Eric in safe_chain.hpp (line 166) what does the word “locator” in the method calls ... mean actually? Thx 
    virtual void fetch_locator_block_headers(
        system::get_headers_const_ptr locator,
        const system::hash_digest& threshold, size_t limit,
        locator_block_headers_fetch_handler handler) const = 0;