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History lesson time, newfriend.
なな means "7"
つば means "leaves", specifically as in leaves of a clover (not a tree, which would be はぱ)
You may be thinking, "This sounds like a Japanese lesson; didn't he say it was a history lesson?"
It's a history lesson.
Long, long ago, before the concept of an imageboard, there was 2ch, or にちゃねる. It would take all day to explain to you what it really is, suffice to say an imageboard without images.
The idea of adding pictures to posts came later, from a spinoff of 2ch known as ふたば, meaning "two leaf" (at this point, merely a contraction of ふたつ "two (things)" and はぱ "leaf" as in any kind of leaf)--aka 2chan.
The site you may regard as the foundational imageboard, 4chan, is in fact a third-generation knockoff of 2ch. 4chan's contribution to this particular meme was to adopt the character よつば as a mascot; thus where 2chan offered two leaves, failchain became a clover (in fact, a green-haired girl with four clover leaf shaped pigtails).
Though seven chan was founded later, the meme carried over. Instead of a four-leaf clover, we now have seven leaves. You may have noticed 7chan's pyramid-shaped 7 leaf favicon in your browser's tab bar, which is probably the earliest ななつば design. I've attached to this post another, circular version. At some point, this was imposed upon the modern 7 pointed throwing star logo you are probably most familiar with.