High Gallifreyan

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The phrase "Hello, Sweetie" in Old High Gallifreyan. (DW: The Time of Angels)

High Gallifreyan was the ancient language of the Time Lords. It was not known by many; by the Doctor's era, it was virtually extinct, superseded by Gallifreyan.

The Doctor claimed High Gallifreyan once possessed immense power when correctly harnessed, such as raising Empires or destroying Gods, the truth of this is unknown.

The written form of High Gallifreyan resembles, to human eyes, a mixture of Greek letters and mathematical symbols.

Inside the Tomb of Rassilon in the Death Zone on Gallifrey, an old rhyme was written in "Old High Gallifreyan" which explained the outcome of the "Game of Rassilon". (DW: The Five Doctors)

Within the Doctor's rooms on Gallifrey there was a painting of a woman, holding a scroll with the words "Death is but a door" written in High Gallifreyan. (PDA: The Infinity Doctors)

The First Doctor wrote his Five Hundred Year Diary in High Gallifreyan to make sure no one could read it. (DW: The Power of the Daleks)

River Song could write in Old High Gallifreyan, which she used to get the Doctor's attention. Who taught it to her so far remains unknown. (DW: The Time of Angels)

In The Time of Angels, Amy asks what writing in Old High Gallifreyan means, thus implying that the TARDIS does not translate it. In The Impossible Planet, writing which the TARDIS cannot translate is deemed by the Doctor to be "impossibly old", and Old High Gallifreyan is certainly very old, although not impossibly so.