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Brackets and arrows instructing that material be moved or aligned.
Also known as: Indent mark, Align mark, Move left or right
Square brackets, arrows and double lines indicating that text should shift left or right, be centred, or be brought into alignment. Positional rather than textual — they change where something sits, not what it says.
Brackets, arrows and paired vertical lines instructing that material be moved left or right, indented, centred, or aligned with adjacent matter.
Positional rather than textual: these marks change where matter sits on the page without altering the words, which is why they are drawn as extents and directions rather than as points.
Double vertical lines in the margin instruct that the marked matter be aligned with the copy above or below it, which is the standard way of correcting a ragged indent.
Square brackets enclosing a block of text, or arrows pointing left or right, or pairs of vertical lines drawn in the margin beside the affected lines.