So is a word that may be used to end sentences. When ending a sentence, it may be:
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Referring back
"So" may be used to refer back to something previously mentioned, such as:
Other possibilities include:
Dangling so
A dangling "so" in conversation invites the listener to articulate or consider the implications of the information provided without the speaker having to articulate it himself or herself. It has been interpreted as sometimes a form of bragging. A dangling "so" in conversation may be represented in text as "so" followed by an ellipsis symbol "…". Examples of dangling "so":
Intensifying adverb
"So" may close a sentence as an intensifying adverb, such as in "I love her so". "So" in the middle of a sentence can also be an intensifying adverb, such as in "I so love her".
References
So (sentence closer) Wikipedia(Text) CC BY-SA