±
{{± | plusValue | minusValue}}
The template can be written "+-" for ease of typing, e.g. 70.5{{+-|2.0|1.8}}.
70.5{{+-|2.0|1.8}}
{{±|2}} returns ±2
{{±|2}}
{{±|2.0|1.8}} returns +2.0−1.8
{{±|2.0|1.8}}