Webster's Revised Unabridged Dictionary · 1913

Facient

Facient , noun

[Latin faciens, -- entis, present participle of facere to make, do. See Fact.]

1.
One who does anything, good or bad; a doer; an agent. [Obsolete] — Bp. Hacket
2.
(a) (Machinery) One of the variables of a quantic as distinguished from a coefficient.
(b)
(Machinery) The multiplier.

The terms facient, faciend, and factum, may imply that the multiplication involved is not ordinary multiplication, but is either some specified operation, or, in general, any mathematical operation. See Multiplication.