But the Symbol Actually Means:
Obsession, addiction and death.
If you're familiar with the Starbucks logo, it's probably because, statistically, you are inside a Starbucks right now. If you're not familiar with Starbucks, that's because you're a hypothetical person created just so we could give this paragraph a satisfying structure.
Either way, you may not have realized that the woman in their green label with the perky breasts and weird twin-fishtail deal going on is a siren from Greek mythology.
According to the Starbucks blog, she was chosen as the logo because Starbucks was looking for a nautical theme to capture the spirit of Seattle. Remember that this was back in 1971, when Seattle was known for sailing and seaports instead of grunge rock, rain and hipsters.
In mythology, sirens are consistently seen as a personification of the ocean -- and that's not a good thing. They're brutal sociopaths who murder you by being attractive. According to scholars, they would sing an "irresistibly sweet" song that "lapped both body and soul in[to] a fatal lethargy." Sailors who crossed paths with a siren would become so obsessed that they would crash into the rocks and die.