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At a guess you're talking about road signs. Rectangular signs give information Triangular signs give warnings Circular signs give orders
Rectangular Hollow Section Pipe means that shape of cross-section of RHS pipe is not round or circle but rectangular or oblong.
There can be no answer to this question. This is because there cannot be a face that is a rectangular pentagon. Rectangular means it has four straight sides while pentagon means it has five straight sides. It can have either 4 or 5 sides - NOT both!
it mean signs
"Regulation sign" Reference: It is regulating something. Failure to obey these signs can result in a traffic citation.