Trailing Twelve Months (TTM)
The timeframe of the past twelve months (the past year) used for reporting financial figures.

Investopedia Says:
For example, the price/earnings ratio is often quoted as P/E (ttm), meaning they're using the EPS from the past twelve months.

Related Terms:
Calendar Year
Earnings Per Share - EPS
Fiscal Year - FY
Fiscal Year-End
Man-Year
Price-Earnings Ratio - P/E Ratio
Tax Year
Year
Year Over Year - YOY

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