It can also be a quick acknowledgment to a message.
Many of the teachers who attended my early in-service lectures came prepared to be bored.
Gets the point across, elicits a response, but also drives toward a solution.
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While a younger person may find a period at the end of a message to be ominous, for example, an older person may be more surprised that anyone is reading meaning into their periods at all, she said.
You can use it for both platonic and sensual relationships.