An infinitesimal point or Neutral Center where sympathetic forces meet in concord.
Also a state or condition of Love, entanglement or concordance (unison) between sympathetic oscillation or sympathetic vibration.
"It [the sphere] is now in condition to denote the sympathetic concordance between living physical organisms, or the receptive transmittive concordance necessary to induce rotation."'' [from 19.02 - Theory of the Induction of Sympathetic Chords to Excite Rotation]
[underline added; this sentence shows the connection to people as we've seen in Atlin, Keely calls sympathetic concordance and is "necessary" to induce rotation]
Mind in Machines
receptive transmittive concordance
sympathetic concordant focalized neutral center
7B.13 - Mind Force in Machinery
9.18 - Atoms as Sympathetic Centers
19.02 - Theory of the Induction of Sympathetic Chords to Excite Rotation