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A doubled rightward bracket adding output to the end of a file.
Two greater-than signs together send a command's output to the end of a file, keeping what is already there — the difference from the single form, which discards it.
POSIX defines the doubled greater-than sign as appending output: the file is not truncated, and writing begins at its end.
Contexts: Software
Two identical pointed brackets set side by side, each formed of two strokes meeting at a point on the right.
Both are built from abstract forms, and both are used in software contexts.