There are two bumper stickers that I routinely see on the road every day.  Unfortunately, unless you are already aware of their significance, the symbols can be ambiguous.  So, I looked them up.  Here's a quick reference:

Above is the symbol of the Human Rights Campaign, a lesbian, gay, bisexual, and transgender (LGBT) lobbying group and political action committee.  Wikipedia also has an article about it.

Above is the symbol called the Thin Blue Line.  It represents the fraternal order of police officers throughout the country.  See the following news article and Wikipedia article for more information.

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