In case anyone’s curious, using \124 in a Lua string literal is a decimal escape for “|” (VERTICAL BAR), which looks to be used as a control sequence introducer here. I assume the subsequent character “c” represents a “color” command followed by a 32-bit color: FFD000 is 24-bit RGB for an orange color that looks like the text depicted on that page, with the preceding FF probably meaning full opacity.
In case anyone’s curious, using \124 in a Lua string literal is a decimal escape for “|” (VERTICAL BAR), which looks to be used as a control sequence introducer here. I assume the subsequent character “c” represents a “color” command followed by a 32-bit color: FFD000 is 24-bit RGB for an orange color that looks like the text depicted on that page, with the preceding FF probably meaning full opacity.