What do the letters on the top of the pantheon mean?

The letters on the top of the Pantheon in Rome, "M·AGRIPPA·L·F·COS·TERTIVM·FECIT," refer to Marcus Agrippa, the Roman statesman and general who commissioned the building. The inscription signifies that Agrippa, who was a consul and son-in-law of Emperor Augustus, built the original temple in 27 BC.