Pentagon contains a Pentagram = occult symbol used by masons etc. Ancient symbol dating back thousands of years. A symboll, amongst others, of protection. Also 5 points of man...legs, arms head. Thus a symbol of man. Also earth, air, fire, water, spirit. A complex symbol. However, the main point, used by those who founded Amarica coz they were masons. For example, Washington is designed following such occult principles and designs. It lay out form symbolic patterns/design.

https://www.historicmysteries.com/pentagram/