Before 2010, the ticker (trading) symbols for US options typically looked like this: IBMAF.
[1] On March 18, 2013, CBOE Mini Options became available for trading on a select group of securities (AMZN, AAPL, GOOG, GLD, and SPY).
[2] CBOE appended a "7" to the end of the security symbol to represent the mini option contracts.
The above symbol represents a call on LAMR, expiring on 1/17/2015, with a strike price of $52.50.
[6] Examples: The above symbol represents a mini call option (10 shares) on AAPL, with a strike price of $470, expiring on Nov 1, 2013 The above symbol represents the standard call option (100 shares), with the same strike and expiration date.