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A caret over a letter, marking an estimate or a unit vector.
Also known as: Circumflex accent, Hat, Caret over a variable, Unit vector hat
A caret over a letter marks it as something derived rather than the thing itself: an estimate in statistics, a unit vector in geometry, an operator in quantum mechanics. Three fields use the same accent for three different jobs.
Marks a quantity as an estimate calculated from data rather than the true underlying value, in statistics.
Contexts: Mathematics
Marks a vector as having unit length, in geometry and physics.
Contexts: Mathematics
Marks a symbol as an operator rather than a number, in quantum mechanics.
Contexts: Mathematics
A small inverted V accent centred above a letter, its two strokes meeting at a point.