In āyātun thalāth, āyāt is a sound feminine plural. The numeral follows the familiar Arabic 3–10 construction in which the numeral and the counted noun display contrasting gender forms.
The feminine plural suffix -hinna in fī kullihinna refers back to those three signs. “In all of them” means that each event is supposed to contribute a distinct piece of evidence to the larger claim.
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al-Ḥārith ibn Ḥillizah: Courtroom Advocacy, Three Proofs and Battle Similes (verses 47–55)
In āyātun thalāth, āyāt is a sound feminine plural. The numeral follows the familiar Arabic 3–10 construction in which the numeral and the counted noun display contrasting gender forms.
The feminine plural suffix -hinna in fī kullihinna refers back to those three signs. “In all of them” means that each event is supposed to contribute a distinct piece of evidence to the larger claim.