majuscule

A capital letter, especially one used in ancient manuscripts.

Capital letters.

Up to this point, Loveday appeared to be an exceptionally typical undergraduate, in that he wrote in majuscule what his fellows scribbled in lower case.

But it is far from impossible that a scribe writing in minuscule should choose majuscule for a correction at this point: for example, if he had written u for n the only way to avoid all misunderstanding might be to indicate the correction with a capital letter.