Значения термина unknown characters на английском

Its records were kept in unknown characters; its sentences were pronounced in unknown sounds.

They were written in the Arabian language, excepting one, which was in unknown characters.

My conjectures on what missing parts might have said, my tentative translations of unknown characters.

He discovered figures of Buddha, a piece of papyrus with unknown characters, vestiges of habitations.

Now, if, in place of the unknown characters, we leave blank spaces, or substitute dots, we read thus:

These works, composed in dead languages, and written in strange and unknown characters, were further provided with commentaries more voluminous and inexplicable than the text.

"I believe you would think the English almost as great gibberish as this looks to you in its unknown characters."