It is unclear what period of time "kalpa" refers to in this case.

Republican period may refer to many periods in several nations, including:

In the modern renaissance of classical education, this period refers to the upper elementary school years.

A period referred to as the 'Ai Noa or "free eating" followed.

This period of Mizo (written) literature usually refers to the period between 1860 and 1894.

The ensuing decades saw a steady decline in Aspen's population, a period referred to as the "quiet years" of the city's history.

A critical period refers to the window of time during which a human needs to experience a particular environmental stimulus in order for proper development to occur.

At its broadest, the period stretches from the 5th to the 16th century and refers to post-Roman but pre modern remains.

After the late Sengoku period (late 16th century) referred to as nioi kuzure.

Group, period, and block refer to an element's position in the periodic table.