title-quotes.woff2 contains only the quote marks ‘ ’ ‚ “ ” „ ′ ″ from Lora (Copyright 2011 The Lora Project Authors), renamed “Title Quotes” as required by the SIL Open Font License 1.1: https://scripts.sil.org/OFL

It is used in post titles because the title font (ZCOOL XiaoWei) has full-width quote marks.