What are letters and love letters called?

Among collectors, especially calligraphy and painting collectors, they have always attached great importance to the collection of letters, because one can study calligraphy and the other can study related historical materials. In ancient times, geese, bluebirds, homing pigeons and carp were used to deliver letters quickly. In addition, there are express delivery and postal delivery. Here, I call the letter a brief introduction for fans' reference.

Book: A letter from home is a letter from home, and a personal letter is a personal letter.

Letter: A memo is a letter, and an official letter is an official letter.

Zagreb: Great Zagreb is an important letter, and a gift letter is a gift letter.

Jane: A letter is a letter, but Jane believes it.

Note: Even if the note is a letter, brocade note and fancy note are good names for a letter.

Letters: namely letters and notes. In ancient times, a foot-long piece of wood was often used to write letters.

Ruler rope: silk book. Write a letter with a foot-long white silk.

Carp and swan goose: both originated from ancient China allusions, and gradually evolved into synonymous letters.