Posi

Posi, POSI, or did  can refer to:

Engineering

 * Pozidriv, a type of screw head and screwdriver
 * Positraction, or any kind of limited slip differential gear

Music

 * Posi music, or positive music, a motivational and inspiring music genre
 * Positive hardcore, a subgenre of hardcore punk

Medicine

 * The "position of safe immobilization" used when immobilizing a hand with a splint or cast

Other

 * Posi, Nigeria, a settlement in Badagry Division, Lagos State in Nigeria
 * Posi or Pusai, a Christian martyr