Letter
A letter was a handwritten or typed document addressed to a specific individual or group.

In 2151, students from Miss 's class at Worley Elementary School sent letters, drawings, and questions to the crew of . ()

In 2267, Jame Finney apologized to James T. Kirk for her outburst, saying she realized how close he and her father had been upon reading about him in letters her father had written to her mother and her. ()

Caylem, a member of an alien species, wrote letters with a pen adressed to his wife without knowledge about her death several years ago. ()

In 2374, the crew of  received letters from their families and friends via the Hirogen communications network. Tuvok from his wife  and Kathryn Janeway from her former fiancé, Mark Johnson. ()

Types 
 Dear John letter
 Thank you note

External link 
 
Literature genres