Sam Fisher- Ajax Nanobots

The most promising approach came from one of Lucchesi's projects, code named Ajax, which involved molecular, photonic-crystal-based robots designed for microscopic electronic repair. Of course, as did most nanotechnologies, Ajax had a plethora of collateral applications, including the signal-hijacking of silicon microchips.

  Once Grimsdottir had extracted the details of Ajax from Lucchesi's mainframe, she turned the project over to her own private laboratory, deeply firewalled within Third Echelon, which set out to transform Lucchesi's robots into microscopic, and therefore untraceable, beacons designed to infiltrate cell phones, laptop and desktop computers, modems, broadband routers--anything that used microchip technology to transmit digital data--and send a prearranged burst transmission using the host device's own internal circuitry. Alone, each Ajax robot was ten nanometers, or one hundred thousand times smaller than the head of a pin; the number of bots required to hijack the average silicon microchip was 125--in all, smaller than a virus.
...

  CUTTING the timing very close, Grimsdottir's package arrived an hour before Fisher was to depart for the airport. He had just enough time to inspect the contents. Grimsdottir's techs had installed the bots into six reengineered gas-grenade cartridges--two equipped with aerogel parachutes and a CO dispersal system, and two with the standard impact actuators--and eight SC pistol darts. In stacked pairs, the larger bots fit neatly into three miniature, partially functional cans of shaving cream, the darts into a large-barrel ballpoint pen. Satisfied, he stuffed one can of the shaving cream into his carry-on bag and two into his checked bag. The pen went into his jacket pocket. He ran down to the waiting cab.
...

  "The six grenades will have the same range as a regular gas grenade and same hang time as an ASE. They'll either disperse on impact or thirty seconds after the aerogel chute deploys. The darts are disperse-on-impact, too. They all rely on kinetic energy, so you have to hit a hard surface."

  "Range?"

  "Variable. Remember, the Ajax bots gravitate to strong EM sources, so you're aiming for hardware, not people. For the grenades, dispersal range is twelve to fifteen feet; for the darts, about half that. They need to be airborne for full effectiveness. Depending on the surface, when the bots hit the ground, friction will negate their EM homing: rough surfaces completely; smooth surfaces . . . it's hard to say."
...

  Fisher dropped his right hand down, behind the soda cup, grasped the butt of the SC, drew it, and raised the barrel. He fired.

  The dart was moving too fast for him to track its course, but decades of range time and combat missions, and hundreds of thousands of rounds of expended ammunition, told him the shot had struck home: the lower seat cushion just above the door's inner kick panel.

  Fisher let the gun dangle, twisting his wrist so the SC was again hidden by his thigh. He raised the straw to his lips and took a slurp and waited for the guards or Qaderi to react. They didn't. Qaderi ducked inside the Mercedes and sat down. The guard slammed the door shut and got into the front seat. Five seconds later the driver was behind the wheel and the Mercedes was pulling out.

  "THE bots are live and tracking," Grimsdottir said four hours later. With no safe house within Fisher's vicinity, she was once again calling on a pay phone. Fisher had found a cheap hotel on Sibiu's outskirts, and then sent Vesa back to Bucharest. "Qaderi is in the air and headed east. We'll know more in a few hours."

- Conviction, Chapter 23, 27, 28