"And a book of remembrance was kept, in the which was recorded, in the language of Adam, for it was given unto as many as called upon God to write by the spirit of inspiration;
"And by them their children were taught to read and write, having a language which was pure and undefiled."
–Moses 6:4-6
https://www.lds.org/
6th Millenium BC
Jiahu symbols
(China)
Dispilio Tablet
(Greece)
Tărtăria tablets
(Romania)