Simplest mixed tensor example

Question

What is a simple example of a mixed tensor, (very) preferably obeying the following:

1. Is of valence $\left( {1 \atop 1} \right)$
2. Does not involve calculus
3. Has an intuitive meaning and usage, e.g: within physics. In other words, is not 'artificial'.

In case not all the above can be satisfied, maybe examples with different combinations can be found.