These are augers.
This is an augur.
The free dictionary defines augur as follows:
1. One of a group of ancient Roman religious officials who foretold events by observing and interpreting signs and omens.2. A seer or prophet; a soothsayer.v. au·gured, au·gur·ing, au·gursv.tr.1. To predict, especially from signs or omens; foretell. See Synonyms at foretell.2. To serve as an omen of; betoken: trends that augur change in society.
v.intr.1. To make predictions from signs or omens.2. To be a sign or omen: A smooth dress rehearsal augured well for the play.
More often that not, my students I are talking about augering not auguring. Though one could argue that when we make hypotheses, we are in fact auguring. I think however, we should avoid using that word in our writing.