point — a fraction whose denominator is some power of 10, usually indicated by a dot (decimal point or point) written before the numerator: as 0.4 = 4/10; 0.126 = 126/1000.
acicula — a needle-shaped part, such as a spine, prickle, or crystal
apex — An Apex or an Apex ticket is a ticket for a journey by air or rail which costs less than the standard ticket, but which you have to book a specified period in advance.
mucro — a short point projecting abruptly, as at the end of a leaf.
mucronate — having an abruptly projecting point, as a feather or leaf.
