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Agriculture | n. phr.
A stepladder with a wide top platform and three legs used by harvesters during milking to collect the olives that are too high to be reached from the ground.

Example

So sometimes Mother Nature need to be helped along by picking, stripping or banging the branches of the olive trees with a cane to coax the olives down. Often a picking ladder a special ladder with a stabilizing third let - is needed, and for that of course you also need tree-climbing skills and a strong safety belt.