It is the substitute usually encountered in high school texts, some other proposed alternatives for the parallel postulate
1. There exists at least one tri-angle having the sum of ils three angles equal to two right angle
2. There exists of similar non congruent triangles
3. There exists a pair of straight line everywhere equal distant from one another
4. A circle can be passed through any three non collinear points
5. Through any point within an angle less than 60 there can always be drain a straight line intersecting both sides of the angle