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In the context of grammar, a semicolon is used to combine two complete sentences that are related. While a period signifies that two sentences are saying different things, a semicolon is used when two sentences are so closely related that a period would be too much of a separation. In other words, a semicolon means that the thought is not quite over even though the sentence is—there’s still more to come.
That sentiment is the idea behind Project Semicolon, a nonprofit dedicated to raising awareness of mental illness, self-harm, suicide, and addiction. "A semicolon represents a sentence the author could've ended but chose not to. The author is you and the sentence is your life."
Project Semicolon was started by Amy Bleuel in 2013 as a way to inspire those going through depression, thoughts of suicide, or self-harm to share their story and to help show them that they are not alone.