What does H1 and H2 stand for with respect to financial reporting and projections?

The term "H1" and "H2" is commonly referred when companies report earnings or sales projection report.

H1 and H2 stand for "half first" and "half second" of a particular year. For example, "H12012" means first half of the year 2012, that is during January and June 2012.

Sometimes the year is divided into quarters and refered as Q1, Q2, Q3 and Q4.