"double period" is correct and usable in written English.
It can be used to indicate a pause in a sentence or to end a sentence with special emphasis. For example, "We cannot tolerate his actions any longer. Double period."
Only it's a double period, usually reserved for reading or math.
Numerical simulations show the system exhibits period vibration, double period vibration and quasi-period motion.
She will be spending a double period today discussing the Electoral College and the historic significance of this election.
Her daughter, a junior, is taking a double period of astrophysics and will take advanced placement courses next year.
Of the five lessons, there would be one lab (for a double period), one test period and three television lessons.
Following the initial three-session introduction mentioned earlier, the workshops will be conducted one day per week for a double period (one hour).
Toward that end, the district has revised its scheduling, providing double periods in English/language arts and math for 60 to 70percentt of its high school students.
But the Romanos are less pleased with the new core curriculum, which requires Jessica to take double periods of math and reading.
Double periods for struggling math and English students — credited for the district's better test scores — would no longer be possible.
Every child who scored in the bottom of four levels -- "far below standards" -- on state and city math tests was scheduled for double periods of math from September to June.
The mechanisms for the transition between chaotic regions and periodic windows have been identified and they include period doubling, period halving, period adding and tangent bifurcation.
