Graphic symbol and Upper-case letter

Graphic symbol noun - A written symbol that is used to represent speech.

Upper-case letter and graphic symbol are semantically related. In some cases you can replace phrase "Upper-case letter" with "Graphic symbol", this phrases are similar.

Upper-case letter noun - One of the large alphabetic characters used as the first letter in writing or printing proper names and sometimes for emphasis.

Graphic symbol and upper-case letter are semantically related. You can use "Graphic symbol" instead a noun phrase "Upper-case letter".