Latin is 8259?

What someone wanted to say, that they want you resume text file to be encoded in ASCII encoding system. There are a lot of other encoding systems, like UTF-8, UTF-16, ISO-XXXX (Where XXXX stands for number), etc. It could be that their are using software that does not support encoding which was used in your resume file and they see hieroglyphs instead of text.

In information security, another word for code or encoded text is ciphertext. Ciphertext is the end result of encoding of plain text.

An empty square box in a text does not have a specific meaning. It often means that the encoding of the text messed up and couldn't send what was typed so it sent an empty box.

The Unicode system was invented to create a universal character encoding standard that could support multiple languages and scripts. This standard allows for the representation of text in different languages and writing systems across various platforms and devices. Unicode helps to ensure consistency and interoperability in text encoding.