I came across the idiom "to put a punctuation mark on something". Having googled a few examples of its usage, I am still not sure what exactly it means. Could you please explain its meaning?
I am especially interested in the meaning of "putting a punctuation mark on what one is feeling" in the following sentence related to self-harm:
It expresses emotional pain or feelings that I’m unable to put into words. It puts a punctuation mark on what I’m feeling on the inside!
(See http://www.helpguide.org/articles/anxiety/cutting-and-self-harm.htm for the full context.)
Here are some other examples that I found using Google. For the first two examples I recommend to read the whole context.
Nelson Giants hammer Hawke's Bay Hawks to put punctuation mark on home season http://www.stuff.co.nz/sport/basketball/69757256/Nelson-Giants-hammer-Hawkes-Bay-Hawks-to-put-punctuation-mark-on-home-season
He’s not saying her name to say it but more to put punctuation mark on his statements. http://ficly.com/stories/26979
And as if all this weren't enough, Tolkien puts a punctuation mark on the brave, wonderful life that is Sam Gamgee's by having him not only marry the pretty Rose Cotton but have thirteen (!) children with her—Elanor, Frodo, Rose, Merry, [...]. It's hard to imagine a clearer or more winsome way for Tolkien to punctuate the novel's pro-fertility theme.
-- The Hobbit Party: The Vision of Freedom That Tolkien Got, and the West Forgot by J. Richards and J. Witt
Basing on these examples, I would say that "putting a punctuation mark on something" means stressing/emphasizing/underlining some point or achievement. However, I am still not sure how to understand it in the sentence related to self-harm that is cited above.