What is Hatsune Miku's "39?'?

Savvy Nerd is correct.

39 can also be read in Japan as "san-kyuu" which sounds like "Thank You". So 39 is also a way for Miku to give thanks to her fans and for her fans to give thanks to Miku.

39 is also why March 9 (3/9) is a special day for Miku, and they always have a big concert on that day, with a theme of giving thanks.

In Japan, March 9 is now known as Miku's Day (ミクの日). On the last March 9, "ミクの日" was a Twitter trending topic in Japan all day long, as tens of thousands of people posted thank you messages to Miku and pictures they had drawn of her.

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RE:

What is Hatsune Miku's "39?'?

is that her special lucky number or something? There's like a 39th giving day concert and A Hatsune Miku Channel 39 on Youtube. What's this obsession over "39"? I'd like to know! =^.^=

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Almost forgotten in awkwardness Washed away while unnoticed Shining in the scribbles A future self who dreamed Even if things are so embarrassing You would have them remain secret If you can’t lie to your feelings Be ready! A burst of shots, jump out Rush towards the goal! It starts here If you dream you must go forth Until you get what you desire Don’t mind, must do well! It’s easy to run away but Just keep walking forwards If a detour appears Now is the time to continue, now or never If you give up, it’s over right? The end of the game? Don’t simply sigh Rush forward Hit reset Never mind failure Can’t run while looking back Don’t mind, must go quickly! I’m a coward and a weakling Who stuffed my wishes in my pocket Even if I stumble and fall I will rise every time, tomorrow is another day! A burst of shots, jump out Rush towards the goal! Accelerate As I progress, I see ahead Even when out of breath I won’t rest Don’t mind, must become strong! Don’t mind, must go fast! Don’t mind, must do well!