US Patent 10105983 Marking pen

A marking pen including a body having a first end, a second end, a longitudinal axis that extends centrally through the body and through the first end and the second end, and a pen adjacent the first end. The body is generally cylindrical from the first end to the second end. The marking pen further includes a fin that extends from the body between the first end and the second end. The fin is integrally formed with the body and has a height measured normal to the longitudinal axis. The height of the fin gradually increases in a direction from the second end toward the first end.