key card

noun
  1. a plastic card, similar to a credit card, containing data on an embedded magnetized strip that can electronically unlock a door, activate a machine, etc.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for keycard

Contemporary Examples of keycard

  • The keycard and phone records would suggest the entire episode in the room took no more than nine minutes.

    The Daily Beast logo
    The Evidence That Could Doom DSK

    Christopher Dickey, John Solomon

    July 26, 2011