March 9th is a special day for green-haired vocaloid fans and mobile suit fans in Japan because the phonic pronunciation of 3 and 9 can be either "Miku" or "Zaku"! Lots of great illustrations are posted annually and here are some of this year's contributions found on Twitter. Check it out!
via @akarisakasu, Pixiv Comic mangaka
This Miku Zaku image is a re-post by a toy designer @kyoryu_kuramo that was done for a previous Miku Zaku Day.
via @SESKOU, illustrator
Another one by @SESKOU
Have a happy 3/9! Which day is it for you?