International Journal of Maps in Mathematics, cilt.8, sa.1, ss.74-84, 2025 (Scopus)
In this paper, we define a new family of curves called principal normal indica-trix (briefly, PNI) of space curves with unit speed in 3-dimensional Euclidean space. During the definition, we use alternative frames and we give some conditions for space curves to be general helix, slant helix, plane curve or involute curve.