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Usually, a blissymbol which looks like a natural object is assumed to be a noun even when it doesn't have the
noun indicator
above it.
For example, this symbol:  means a
Building
with
or without
the noun indicator.
This one means
mountain
with or without the noun indicator:
 or
But the
Roof symbol:
and a few others are a different matter.
The symbol above means roof only when it has the noun indicator above it.
Otherwise it means
Protection :
This allows a concrete object like a roof to represent an abstract concept which can then be adapted to many other meanings.
For example, just adding an
adjective indicator
to the protection symbol gives us the adjective,
safe :
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By further adding the
Emotion
or
Mind
symbols we get other kinds of safety:
Emotional Safety : 
Mental Safety : 
Bodily Safety : 
Or add the Money symbol
and we have
Financial Safety : 
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