Yawara / Kubotan

The Kubotan is a Japanese weapon that is used in several martial arts. It is also called Pasak, Dulo-Dulo or Kongo. (Source Wikipedia)
Sōke Takayuki Kubota developed the Kubotan as a self-defense keychain for female officers in the Los Angeles Police Department and trademarked the name in 1978.  (Source Wikipedia)
Self-defense techniques are learned, which can be executed with all objects that are similar to the Yawara, for example, pencil, pen, Kubotan.