# The term for the negative equivalent of a peak point on a graph

What is the negative peak point called on a graph as below?

• I think this isn't a suitable question for ELU. The word is troughs. Commented Sep 17, 2015 at 17:23
• He used the word troughs, specifically, Definition 7 of that link. Commented Sep 17, 2015 at 17:24
• @FumbleFingers the dip is a trough, but that describes the overall dip, rather than the lowest point.
– Dan
Commented Sep 17, 2015 at 19:09
• While possibly not directly relevant to the pictured time series (so perhaps not directly an answer to the Q), in some circumstances (e.g if the graph is of a density, density estimate, histogram, stem&leaf plot, dotplot/stripchart, barchart with ordered categories, frequency polygon etc), antimode is a possible choice. For example, see the question here and a comment here. Commented Sep 18, 2015 at 0:13
• @Dan: The question now is totally different to what is was yesterday (originally OP simply asked ELU to transcribe the relevant word from a video clip). Commented Sep 19, 2015 at 14:56

• Nadir works. The highest point is the apogee. Commented Sep 22, 2015 at 22:54
• If the downvoter could explain what they think is wrong, it would help me improve the answer. Commented Dec 20, 2016 at 15:39

Mathematically speaking, it is called a global/absolute minimum. The smallest value in a set of minima.

• This is the correct answer. There may be other ways to describe it, but in terms of mathematics, this is simply what it is. Also note as the graph indicates, if it's the bottom of a dip, but not the deepest dip, it is a local minimum.
– Dan
Commented Sep 17, 2015 at 19:08
• Also note that the image is wrong on one count: it should say global minimum, not global minima (that would be the case if there were more than one of them there, but there isn't). Commented Sep 17, 2015 at 21:57
• I don't disagree, but I think the OP is asking for a "local minumum" since there is nothing in his/her graph that implies it must be the global minimum. Commented Sep 18, 2015 at 8:47
• On the graph "global minima" should be labelled "global minimum" because it is singular.
– Ben
Commented Sep 18, 2015 at 11:14
• In terms of register, this is quite wrong. The dual term for "peak point" is not "absolute minimum", is it? "Trough", as suggested by FF, is much more to the point. Commented Sep 18, 2015 at 11:53

There are lots of commonly used words/phrases:

• trough
• valley
• minimum
• low point
• dip
• bottom
• floor
• anti-climax

In my experience, one typically speaks of "peaks" and "valleys".

The other terms mentioned in other answers are not incorrect, but they also are not parallel to the figurative geographic description of the high points as "peaks". Only "valleys" has this appeal.

It can also be called a (negative) peak in some contexts, such as spectroscopy, chromatography (which accounts for most of the hits for "negative peak" on google) and electronics (in peak-to-peak signal amplitudes, one of the peaks is positive, the other negative).