Perhaps, but use of TK as a placeholder is fairly common. I've been using it for years, and I learned it from a jounalism handbook, IIRC. It's quite embarassin

Perhaps, but use of TK as a placeholder is fairly common. I've been using it for years, and I learned it from a jounalism handbook, IIRC. It's quite embarassing when you forget to replace them before you publish though, so I have a section in my Markdown to docx/pdf/whatever Pandoc build scripts that errors if there are any remaining TKs.