microscript means very small lettering (especially handwriting), or a handwritten manuscript consisting of such writing.
Etymology
From micro- + script.
noun
- Very small lettering (especially handwriting), or a handwritten manuscript consisting of such writing.“Impromptu, selfreflexive, and distinctly owlish, the microscript is quite different from the two feuilletons that W. extracted from it for the periodical Sport im Bild.”