A4 is a size of paper. Standard letter size.
Jin reached his storehouse and entered from the side door. Before he proceeded to the underground floor, he created an A4 paper sign and placed it outside. "Not open in the morning for weekdays."
Fantasy · Moloxiv
See this! I just gifted the story: Balloon
ch 0 6 An Indeclinable Declaration of Battle
Eastern · Bright Moonlight Frost On The Ground
F
Can I get an F for myself in the chat?
How to Raise Your Regressor
Fantasy · Anit666