See also Authentication, Password management, Password, Password manager, Single signon, MFA-2FA, Microsoft Hello, Apple Face ID, Facial recognition, Biometric authentication, Iris recognition, Retinal scan, Eye vein verification, Recognition, Fingerprint recognition

A pin is a device used for fastening objects or material together.

Pin or PIN may also refer to:

• Personal identification number (PIN), to access a secured system
  • PIN pad, a PIN entry device
• An image on Pinterest
• PIN diode, a semiconductor diode
• Pin, a short lead in electronics
• Pinning, the act of attaching a social media post to the top of a page to signify importance. This function is implemented on platforms such as Twitter and Reddit
• To pin an object to another object, such as pinning an application to the taskbar