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Three lines under a letter instructing that it be set as a capital.
Also known as: Set in capitals, Three lines under a letter, Small caps mark
Three straight underlines. Two lines mean small capitals and one means italic, so the count is the whole instruction — and miscounting is the commonest way this part of the system goes wrong.
Three straight lines under a letter or word, instructing that it be set in full capitals; two lines instruct small capitals.
The count is the entire instruction, so a miscounted or carelessly drawn set of underlines changes the result — the commonest failure mode in this part of the system.
The reverse instruction, to set a capital as lower case, is marked by striking the letter and writing 'lc' in the margin rather than by an underline.
Three straight horizontal lines drawn one below another beneath a letter or word.
Both are underline marks in the graded typeface-change set.