It is either a maximum or minimum value depending on its downwards shape or its upwards shape
A parable.
It is a parable because it is used to prove a point. In this case, it is used to show that greed won't get you anything.
The vertex, or maximum, or minimum.
Workers in the parable of the vineyard were paid one denarius regardless of the hours worked.
In this parable it means all who hear the word of god , need not be saved as they may reject the gift of salvation, through gods word.
Such a point is usually referred to as a 'trough' in economics, due to the shape of a graph indicating the high and low points of an economy (typically by GDP, etc).
The slope of the tangent line at the maximum point of the curve is zero. So we say that as a curve point approaches to the maximum point, the slope of the tangent line at that point approaches to zero.
The point on the parabola where the maximum area occurs is at the vertex of the parabola. This is because the vertex represents the maximum or minimum point of a parabolic function.
There are nine parables in the Gospel of Mark: the parable of the sower, the parable of the lamp, the parable of the growing seed, the parable of the mustard seed, the parable of the wicked tenants, the parable of the fig tree, the parable of the wedding feast, the parable of the ten virgins, and the parable of the talents.
Parables are usually fictional stories with a spiritual lesson contained within them. Lectures are the presentation of information. However, a lecture may well contain a parable in order to illustrate a point.
This growth shape allows maximum light to all foliage.