The equatorial low-pressure belt is also known as :
Doldrums
Near the equator (about 5° N to 5° S) intense heating makes air rise, creating a belt of low pressure where the north-east and south-east trade winds converge.
Because the air mostly moves upward, surface winds are very weak or calm, and sailing ships were often becalmed there; this calm belt is called the Doldrums or the Inter-Tropical Convergence Zone.
The Roaring Forties are strong westerlies near 40° S, the trade wind zone lies between the subtropical highs and the equator, and the Horse Latitudes are the subtropical high-pressure belts near 30° N and S.
Hence, Doldrums.
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