A scalar such as temperature can be negative, and there the minus sign indicates:

1. A negative number does not by itself make a quantity a vector. 2. Note that a scalar can be negative, such as a temperature. 3. In this case the minus sign indicates a point on a scale rather than a direction. 4. Temperature does not change at all with direction changes, therefore it has magnitude only. 5. Displacement's minus sign, by contrast, really does record a direction. _Source: OpenStax College Physics for AP(R) Courses 2e (CC BY 4.0), Ch 2 'Kinematics', sections 2.1-2.8_