It shows how it relates to the actual house. Without scale, you would need as much paper as there is house. Example: a 30 foot house with the scale of 30:1 would be drawn as being 1 foot tall.
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An underline on a dimension means that it is not to scale.
Do you mean WHERE on the scale?
It could possibly mean the element Helium or He as in reference to a male.
Broke my scale
A bar scale- helps you find the distance between two places on a world map.