It is the classic high voltage warning symbol in yellow and black contrast.

It is the chemical weapon warning symbol in yellow and black contrast.

It is the iconic radiation hazard warning symbol in yellow and black contrast.

It is the iconic biohazard warning symbol in yellow and black contrast.

They are plastic caution tapes that are used to block people out of investigation area.

There are 8 types of signs printed in black and yellow. Each type has different designs and wordings.

Wrinkles must appear on these long plastic tapes.